Do you eat at all while you are bowling?  If so maybe it is salt intake?  Also drinking during bowling can cause swelling especially if you are eating at the same time (pretzels/popcorn/nachos) are the "big three" that I try and avoid while bowling.  Sometimes it can't be helped, but reducing swelling in your fingers is just a simple fact of cooling them off.  Cup of ice...freeze a potato after you have put "finger holes" in it...sounds stupid but it works. Run them under cold water can also assist in keeping the swelling down.  If you find you can't keep them from swelling, then get some chapstick and put it on your finger nails, this will allow your fingers to slide into the holes much easier.  FWIW.  I've done all of the above and for me...I lost weight...problem solved.

Make sure if you do the coke can in the freezer, DO NOT USE a diet.
They will explode in the freezer when then expand. Had cans in a fridge way in the back and they froze and popped the top.  No fun to clean up....
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EAGLE-LORD OF THE SKYS

For the fingers, ditch your standard finger insert installation and try Vacu Grips, as they contour to your fingers whether swollen or normal sized.  For the thumb, Vise Hada Patch on the back of the thumb to reduce friction and hopefully reduce swelling.  Use rosin to keep your hand dry and keep your hand somewhat elevated if it begins to swell.

Sucking on ice between frames helps keep your body temp down, will help prevent swelling.  Size your finger holes to fit when your fingers are swelled.  They'll be loose when they're not, but really doesn't make any difference - you only use the front of the hole to lift and turn anyway.  If you use grips you could try the vacu-grip or just use pieces of a business card behind the back of the grip.  --  JohnP

Alternative, is to do as John P stated, Have fingers drilled for swelling but do not glue tops of finger grips which will allow you to tighten up holes with small pieces of paper.  When fingers swell, just remove paper.....

Thanks for all of the suggestions..i generally do not eat while bowling however I am one to have a couple of drinks...I will give the water drinking a try...Thanks again

Paul
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Why is it happening...only on this ball and not other balls?

Something you bought that has a different fit than your other stuff?
Never redrilled?

REgards,

Luckylefty
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Open the door...see what's possible...and just walk right on through...that's how easy success feels..