What can cause top of racquet to flatten out 1/4" inch

I ran into an unusal situation with a newer model 2015 Gearbox teadrop racquetball racquet a few months ago and yesterday as well. This might be something that could happen to some tennis racquet, but I don't know.

It is a 2015 Gearbox GB170 teardrop shaped racquetball racquet (2 of them). They were well used and had many hard wall hits with it. A friend bought both and gave it to me to restring. I noticed right away that the top of both racquets were not a teardrop shape, but flattened. I cut out the strings and the normal teadrop shaped returned on both. (thus I gathered the previous stringer had mis-strung the racquets.

I mounted one of them on my stringer (Gamma X-2) and proceeded to string it at 35 lbs (what he wanted), and restrung it exactly like all the other gearbox racquets that I do, including my own. The suggested range is 30 lbs +/- 5 lbs, so I was in the normal range. Every thing looked great as usual, but when I was done and loosen the supports, the top of the racquet flattened out almost 1/4" and what worse did not have the teardrop shape anymore.

I thought I made a mistake and restrung it again with the exact same results. Since it was like that when I got it, I assume that is what happens on this particular racquet. He played a lot of tournaments on them and even won a couple of them. He says that it hits and plays fine, but just doesn't like the flatten look and it distracts him.

I had the chance to see a new 2015 model teardrop racquet in a buddies bag and it to was flattened out at the top. What tops it off, the pics on sites that sell it, shows a nice teardrop shape.

Does anyone here might have a clue as to what is going on and what could cause this to happen and should the factory provide information that this could happen so restringers will not be surprises when it does and that it is normal and acceptable ?
 

esgee48

G.O.A.T.
Several issues can cause a frame top to collapse. Tower creep, unsupported frame at 12:00 (too much room between frame and support), differential tension where mains are much higher than crosses. If you did not have any of these problems, you're OK. However, when I looked up strung images of the GearBox frames, they all had flatten tops, at least according to RacquetBallwarehouse.com. None had what I would consider to be a tear drop shape. 2 cents.
 
Thanks esgee48,

I don't have this problem with any of their teardrop racquets before 2014. They keep the same shape strung or unstrung. This racquet and I guess future ones will have the flatter appearance after being strung. Plus, the length of the racquet is being reduced by 1/4" or so, thus it has to be making the top of the racquet flatter looking when strung. They had to have done something in their design and or materials to make it do this, where as before 2014, everything was just fine.

Some day, I just might have to increase the tension on the crosses, just to see if the shape and length of the racquet stays the same strung as unstrung.
 

esgee48

G.O.A.T.
Look here
Gearbox (expensive, aren't they?)
http://www.racquetballwarehouse.com/GearBoxRacquets.html
PK
http://www.racquetballwarehouse.com/ProkennexRacquets.html

If you check the curve at the top of the frame, GB seems to be fairly flat. The PKs also exhibit this except for the 750 and 700 which still have a pronounced curve. It's a kick to see how expensive these frames are; and they're using less material, but probably more technology to prevent the material from collapsing.

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The PK racquet pics in your links are a good example of what is happenning with the newer Gearbox racquets.

When I cut the strings out of the newer Gearbox teardrop racquet , it looks like the PK 750 with it's nice pronounced curve at the top. After I restring it, the GB racquet looks like the newer PK racquets that are almost flat on the top.

Plus as I mentioned you can actually see the top of head of the GB racquet collaspe downward when unmounting the racquet. To me that can not be a very good sign when stringing any racquet. I definitely will not be buying any of these $250.00 racquets and might refuse to string them in the future unless the owner signs a wavier of some sort.

Anyways thanks for the replies esgee48.
 

esgee48

G.O.A.T.
You're welcome. I happily forgo all requests to do racquet ball frames! I did not realize how expensive these frames have become. I always thought they were < $100! At least I know I will never break one of these on the stringer. :)
 
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