I was riding my snowmobile this weekend, and I smoked the clutch side piston, so now I'm starting to tear the engine down and rebuild it. My question is (obviously)- how do I remove the circlips from the piston? There is a small notch in the piston that looks like it is there to facilitate removing the circlip, but I'm not exactly sure how to do it. A small screwdriver didn't seem to do the trick. Not that it matters any, but the machine is a 1995 Yamaha Phazer II. Any tips would be appreciated.