It really is a personal thing.
One person may use light grip pressure, another heavy grip pressure, someone else might have very large hands, another very flexible joints.
you see what I''m getting at.
I personally like it so my thumbhole is on the big size and I use medium grip pressure. why? thats what I have found is comfortable, it''s as simple as that.
One tip I will give is to NOT READ ARTICLES on thumb fit. I read and was told for years that your thumbhole must be tight, it must be snug and I bought into that. I had for years and years pain in my thmb, thrown the ball half way down the lane, some reverse pitch and many days of just chucking the ball down the lane with two hands due to swelling when the thumbhole was too snug.
Trial and error is the key
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Hammer has set the trap Hammerheads.
"Get them kiiids of the STREET!" -)
Edited on 7/13/2010 8:16 PM