The string always breaks near the knot (Yonex vcore 95 2023)

L

leonhard

New User
Sorry for posting this here, but I’ve already posted it in the racket forum and maybe it didn’t reach the right person who can help me.

My Yonex VCore 95 2023 always breaks the string at the knot after just 10 minutes of play. It always breaks in the same spot. I’ve had it strung by two different stringers, and this happens with both of my rackets. This has never happened with my other rackets. I’m posting here because this is my last hope before selling these rackets. It’s impossible to play with them.

The strings that broke were the Signum Pro Firestorm and Pro's Pro Red Devil. The racket is new (less than 10 hours on the court) and the grommets are new.

I changed the stringer. He strung two rackets, one with 2 knots and the other with 4 knots, and neither had the issue of breaking at the knot. I thought I had found the solution.
However, yesterday, with the same stringer, one racket's string broke after 10 minutes.

Has this happened to anyone else?
 
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That does not look like it is breaking at the knot. It is breaking on the main 1 string inside from the knot and that is a pretty common place for those racquets to snap string especially on a newer-ish racquet. If you look that is pretty tight turn that string makes. I have seen natty gut snap there.

As far as a solution I would take a look at that grommet (not the knot but the one main in toward the center) and also the outside of the frame and make sure there is not a sharp edge the string is catching on.
 
I've been through countless restrings of mine over the past 12 months and never had this issue. As others have stated, it seems to be an issue with that particular grommet, maybe the stringer has caught it at some point?
 
I have two VCore 95 rackets. This has been happening with both since I bought them.
I don't think the stringer damaged the grommet. It's still new. Unless the grommet came with a manufacturing defect, but it's strange because it happens with both.
 
LOBALOT said:
That does not look like it is breaking at the knot. It is breaking on the main 1 string inside from the knot and that is a pretty common place for those racquets to snap string especially on a newer-ish racquet. If you look that is pretty tight turn that string makes. I have seen natty gut snap there.

As far as a solution I would take a look at that grommet (not the knot but the one main in toward the center) and also the outside of the frame and make sure there is not a sharp edge the string is catching on.
Click to expand...
You say this is quite common to happen. Has this ever happened to you?
 
I have 3 07VC95s and probably restrung at least 20 times on each without the string breaking at the grommets. I've also replaced the grommets at least 4 times on each racquet so you could try replacing and see if it fixes the problem? Worst case, you'll have back up grommets.
 
Either there is a problem with that grommet hole location or the stringers are pulling tension on the knot string around that bend and creasing the poly there. I would be very curious to know if it's happened on both sides of the frame or just that one side. The fact it's happening with two frames is already weird, but I suppose there could have been a manufacturing issue. For it to happen on both frames and on both sides of the frame would make me think it's something with the stringing.

If it were me and it happened on my frames I would pull the grommet out to that hole and examine it and the frame there carefully. But I string my own frames and use polys that I know don't shear break easily. I'm not familiar enough with the particular strings you are using and you also didn't tell us the tension you are using either, so not sure how odd it is for them to break at a bend like that.

Do you mishit down low frequently?

In any case it seems unusual.
 
Kevo said:
Either there is a problem with that grommet hole location or the stringers are pulling tension on the knot string around that bend and creasing the poly there. I would be very curious to know if it's happened on both sides of the frame or just that one side. The fact it's happening with two frames is already weird, but I suppose there could have been a manufacturing issue. For it to happen on both frames and on both sides of the frame would make me think it's something with the stringing.

If it were me and it happened on my frames I would pull the grommet out to that hole and examine it and the frame there carefully. But I string my own frames and use polys that I know don't shear break easily. I'm not familiar enough with the particular strings you are using and you also didn't tell us the tension you are using either, so not sure how odd it is for them to break at a bend like that.

Do you mishit down low frequently?

In any case it seems unusual.
Click to expand...
This only happens on one side. Sometimes, as you can see in some photos above, it breaks at the bottom and the top, but always on the same side. Not once did it break due to a mishit in that area.
 
Roads_to_tennis said:
@ what tension?
Now I think only filming it can help you as I never knew your strings are breaking at top too
Click to expand...
45 lbs.
If you look at photos 2 and 4, you can see that it broke at the top on the same side. When the bottom and top knots are not on the same side, it breaks at both the top and bottom. I forgot to mention that.
When the top and bottom knots are on the same side, it only breaks at the bottom (last photo).
 
So your stringer should tube all 4 'problem grommet areas.'

Idle thought or musing. The next time you need to restring the frame, keep a longer scrap from the strings you cut out. Then insert that scrape and try to create a top groove on both side of those 4 grommets. You run the string back and forth until a shallow channel appears. These channels will appear by themselves if you string the frame frequently. (You are hastening the wear.) My suspicion is that the grommet tubes are not fully seated and that a small edge is created when tension string is installed. Tubing goes provides a cushion against that edge. But it also slows the creation of that channel. That phantom edge will reappear only under string tension. The newly created groove should provide a channel for the string to avoid that edge. That's why it is very important to make sure the new grommet tubes are positioned so that they seat properly the first time. I have received racquets from clients where tubes are not seated correctly. I seat those grommet tubes so that they are flush etc BEFORE I start restringing the frame. And when I get to those holes, I make sure that I do not pull the tubes ajar. If I can't seat those areas, I will tube the grommet if the angle is more than 90 degrees. YMMV.
 
Finally I see someone dealing with this as well lol

I string for a pro on tour and it took me about 2 years to find the solution. Everybody was gatekeeping it or just wasn't bothered. I found a semi-permanent solution that prevents the string from breaking. What happens is the frame cuts through the grommet so the string sits on the actual frame not the grommet. Yonex rep is aware of this but not really fixing it.

I can make a video and explain in detail what to do to solve it.
So maybe DM me and I'll WhatsApp you.

Edit: Tubing the grommets also helps for sure. But you have to re-do it every time you re-string. If you only string at one stringer it's fine to do that but if you're looking for a more permanent solution there is also that.
 
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With Yonex, I think the sharpness of the turn is what hurts. Also note that the Babolat pure drive has the grommet split problem
 
WNB93 said:
It will but not all stringers have tubes.
Click to expand...
-teflon tubbing (or similar), is "a must have" for stringers
-its cheap and 1 pack last a long time
-teflon tubbing is different than individual grommet replacements

-anyway, good luck finding the solution that works for you

-btw, one other thing i do, is i grease/lubricate that grommet hole in question, helps sometimes!
 
WNB93 said:
I string for a pro on tour and it took me about 2 years to find the solution. Everybody was gatekeeping it or just wasn't bothered. I found a semi-permanent solution that prevents the string from breaking. What happens is the frame cuts through the grommet so the string sits on the actual frame not the grommet. Yonex rep is aware of this but not really fixing it.
Click to expand...
If I had racquets, from Yonex of all companies, that were manufactured so poorly that the frame cut through the grommets and caused string breakage like that I would return the frames and get something else. If it's that bad then that frame is not fit for purpose.
 
WNB93 said:
What happens is the frame cuts through the grommet so the string sits on the actual frame not the grommet. Yonex rep is aware of this but not really fixing it.
Click to expand...
If this is what's happening, op, get a small thin diamond needle file and chamfer the inner and outer edges of the offending grommet hole/s.

If you know a good machinist, see if they have a 3/32" or type "A" Cogsdill burraway tool.
 
mtommer said:
If this is what's happening, op, get a small thin diamond needle file and chamfer the inner and outer edges of the offending grommet hole/s.

If you know a good machinist, see if they have a 3/32" or type "A" Cogsdill burraway tool.
Click to expand...
Don't worry, found a solution. A simple file for 2$ is enough to work on the graphite. Even rolling a piece of sandpaper and using that works.

But looks like leonhard has not yet found a solution.
 
1HBHfanatic said:
-teflon tubbing (or similar), is "a must have" for stringers
-its cheap and 1 pack last a long time
-teflon tubbing is different than individual grommet replacements

-anyway, good luck finding the solution that works for you

-btw, one other thing i do, is i grease/lubricate that grommet hole in question, helps sometimes!
Click to expand...
Tell that to the WTA, ATP and especially ITF please :)

Not every tour stringer knows what they're doing. They're ok in 90% but some are stuck in '78.
 
Kevo said:
If I had racquets, from Yonex of all companies, that were manufactured so poorly that the frame cut through the grommets and caused string breakage like that I would return the frames and get something else. If it's that bad then that frame is not fit for purpose.
Click to expand...
It's the problem that most pros are not using the 07 Vcore and it doesn't really break for rec. players as we tend to not hit hard enough. So I suppose that when they tested it didn't really show up as a big issue and was probably noted as stringer error because it's near the knot.
 
WNB93 said:
Finally I see someone dealing with this as well lol

I string for a pro on tour and it took me about 2 years to find the solution. Everybody was gatekeeping it or just wasn't bothered. I found a semi-permanent solution that prevents the string from breaking. What happens is the frame cuts through the grommet so the string sits on the actual frame not the grommet. Yonex rep is aware of this but not really fixing it.

I can make a video and explain in detail what to do to solve it.
So maybe DM me and I'll WhatsApp you.

Edit: Tubing the grommets also helps for sure. But you have to re-do it every time you re-string. If you only string at one stringer it's fine to do that but if you're looking for a more permanent solution there is also that.
Click to expand...
Finally, I found someone who experienced this too. I was thinking, as unlikely as it seems, that it might be an issue with my two rackets.

Does this happen with all Yonex models or only with the VCore 95 2023?

I didn't quite understand this part: "What happens is the frame cuts through the grommet so the string sits on the actual frame not the grommet."

My racket is new, the grommets are new, and from what I can see, none of the grommets appear to be damaged.
But thank you for the tips! I'll try a solution, and if anything, I'll send you a DM.
 
WNB93 said:
Don't worry, found a solution. A simple file for 2$ is enough to work on the graphite. Even rolling a piece of sandpaper and using that works.

But looks like leonhard has not yet found a solution.
Click to expand...
Sorry. By op I meant leonhard.
 
The "grommeted strings breaking due to the contact with the frame holes" issue I have seen is not so much a frame problem as a grommet problem.

It appears to me that the combination of a radical turn in the string; perhaps too stiff or brittle a material mix in the plastic grommet; perhaps some temp. exposure issues
all combine to make the grommet susceptible to splitting....
 
stapletonj said:
The "grommeted strings breaking due to the contact with the frame holes" issue I have seen is not so much a frame problem as a grommet problem.

It appears to me that the combination of a radical turn in the string; perhaps too stiff or brittle a material mix in the plastic grommet; perhaps some temp. exposure issues
all combine to make the grommet susceptible to splitting....
Click to expand...
Seems that way yes. But it's not the grommet splitting but it's just getting cut. If I get my hands on a string free racket from before I was fixing this I'll show you.
 
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