well it depends ik a few people who have there flat but ik a few that are not fully flt cause there fingers wont go flat but bend abit jsut like my self my fingers bend abit but the pawm of my hand is still touching the ball.
it dose fell good when its drilled for your hand feels better then if it is to short or too long im caus ei got a few other bowling balls with spans to short and sinc ei startedgetting new bowling balls drilled uo for me the ball seems to be coming out of my hand alot bette.
about your hand getting red and stuff it could be that the thumb hole is abit to small or your gripping the ball but if your thumb is starting to hurt abit u can go and get some finger protecting tape and but it on your thumb up the back or both sides it also helps with good releases.
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