I noticed last night that quite a few of my 130mm Ranger and RangerGrip knives have scratches on the buttons, deep enough to see and feel. The scratches are crescent shaped, right where your thumbnail hits when you push the button. The thing is, none of these knives have gotten very much use, so the scratches develop really easily. The buttons seem to be made of pretty soft plastic, is it cellidor? I wish they'd use a little tougher material for the button, I imagine quite a lot of people use the tip of their thumb to fully actuate the lock. How about you guys, anybody else have scratched up buttons? I'm going to try using the side of my thumb more than the tip, see if I can keep the problem from getting too much worse.