Does anyone know of anything that is out there to account for a thumb that swells as the game goes on, i.e. something like a spongy thing that would give as the thumb expands. I thought there used to be something like that available.  ANY imput appreciated  Thanks.

The Thumbillow is also available.  I've tried both and prefer the Magic Carpet.  --  JohnP

I also use Magic Carpet and like what it does for me, as far as not having to squeeze the ball to hold onto it.  However I have been having issues with thumb swelling starting around the middle of the 2nd game on... I've been EZ-Sliding my thumb 2 out of the last 3 weeks to help eliminate sticking. I'm thinking what I need to do is sand out the thumb hole a little bit, then add the Magic Carpet, then add tape... then take the tape out as my thumb swells up.

Exchangable thumbholes also work pretty well.  I have three different inserts that are progressively larger.
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220...221...whatever it takes.