I definitely get some form of "tendinitis" from pushing the flipper buttons so hard. Can't help it. I know that pushing them hard will not make any difference on the shot but when I'm trying to get that ball up a steep ramp I push the damn button harder! makes my forearms real sore....sometimes for a couple/few days if I'm on a marathon session like at Dayhuff's party. It was bad enough at the expo that I switched to using my middle fingers.....then they got sore...lol.