TRD,

Nice so you finally found one eh? Let me know how it goes..

Hey back to the topic at hand, sounds like just a stripped button, you can pop the stripped one off the head and just replace it, did it strip while the motor was running, or have you moved the piston since it stripped?

There could be small bits of metal in the cylinder so you're going to want to clean those out when you have the head off, anyone have any tips on that?

Good luck!