6 point mount coming loose or too tight during stringing??

HunterST

Hall of Fame
#1
Everytime I string, I mount my racquet, trying to follow instructions by YUlittle. I adjust each set of arms to where they are just snug, only using my fingertips to turn the knobs so as not to over tighten. I make sure that none of the brackets are wiggling or too lose.

The last few times I've been stringing, I've noticed in the middle of the job that one set of brackets have come so loose that I can wiggle them back and forth. Other times, I'll find that the racquet has become disturbingly tight, much tighter than I initially mounted it.

Any idea what is going on here and how to avoid it?
 
#2
You get that because of frame movement, I learnt that on my ERSA Course with @uk_skippy so I'm sure he can drop his 2cents on this also. But definitely do not adjust them whilst stringing, it'll damage and stress the frame.
 
#3
When you do the mains, expect the frame to try to squash. This means 6/12 should be tight. Your side supports may also be tight depending on how snug you made the side supports. If the lower side supports near the throat get tight, it means [to me] you did not tighten the 6/12 enough. I have also experienced having the upper side supports tightening up only when doing bottom up crosses. Again, it went away when I make sure the 6/12 supported the frame correctly. I would adjust nothing while stringing. If the frame loosens back to normal when all the crosses are installed, you're OK. You should check the length of the frame before and after stringing. Should see less than ± 2mm of change unless you have a differential.
 

HunterST

Hall of Fame
#4
When you do the mains, expect the frame to try to squash. This means 6/12 should be tight. Your side supports may also be tight depending on how snug you made the side supports. If the lower side supports near the throat get tight, it means [to me] you did not tighten the 6/12 enough. I have also experienced having the upper side supports tightening up only when doing bottom up crosses. Again, it went away when I make sure the 6/12 supported the frame correctly. I would adjust nothing while stringing. If the frame loosens back to normal when all the crosses are installed, you're OK. You should check the length of the frame before and after stringing. Should see less than ± 2mm of change unless you have a differential.
That's the werid thing. It's not just during tensioning. I agree it would make sense if it got tight while pulling tension and then went back to how I originally mounted it. What I've been noticing is it staying overly tight or overly loose. A few times I've gotten through a whole job, gone to remove the racquet and then discovered the racquet was in way tighter than I had it originally.
 
#5
That's the werid thing. It's not just during tensioning. I agree it would make sense if it got tight while pulling tension and then went back to how I originally mounted it. What I've been noticing is it staying overly tight or overly loose. A few times I've gotten through a whole job, gone to remove the racquet and then discovered the racquet was in way tighter than I had it originally.
Try using suggested tension on the Stringway Online TA.
 
#6
That's the werid thing. It's not just during tensioning. I agree it would make sense if it got tight while pulling tension and then went back to how I originally mounted it. What I've been noticing is it staying overly tight or overly loose. A few times I've gotten through a whole job, gone to remove the racquet and then discovered the racquet was in way tighter than I had it originally.
The cause of the problem is the wrong difference in tensions between the mains and the crosses:
A racquet head should have the same length and width after stringing as it had before without the strings.

When the tension on the crosses is too low the racquet will be shorter and wider and because it is wider the force on the outside supports is higher and the racquet can get stuck.

SO
The only right difference in tension between the mains and crosses is the one where the length of the racquet is exactly the same before and after stringing.

These tension depend on the shape of the racquet head and the number of mains and crosses.

The solution to this problem is easy as Irvin says:

Try using suggested tension on the Stringway Online TA.
 

am1899

Hall of Fame
#7
OP - what tension are you stringing the mains, and what tension for the crosses? As @esgee48 mentioned, if there’s a delta (especially a big one) between the tension value for the mains and crosses, that could cause the issue you’re experiencing - even if the racquet is mounted correctly. Additionally, “spin effect” type racquets can be tricky - often there’s less cross strings than would usually be the case, which makes maintaining the natural shape of the racquet more challenging.
 
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