I have recently made myself a snapper pick and happily went about snapping locks open, after a while I got bored with that and went back to SPP'ing. However I could not SPP a couple of my master lock 140's that I had been snapping open.
After a great amount of frustration, time, and more force than I would normally use(leading me to believe that the pins have slightly deformed) I have SPP'd all of them again.
Is it possible that snapping damaged the pins in a way that would make SPP more difficult ? And if so could I make my snapper picks a little weaker so that it would still get an open but not damage pins ?