Hi all, somewhere in this thread I read a statement that a club only had one bitten and that was because, he never followed the safety of working behind the plane. PLEASE be careful working from behind also, I was bench running a 120 twin 2 stroke, with and 16x10 apc prop,the engine dropped one cylinder at idle so I quickly put on my glow driver and it popped back to life. I then went full throttle and the engine was running at app. 9000rpm, but it sounded like it was lean. So I decided I could just tweak it with my screw driver FROM BEHIND, the engine stopped suddenly, and the screwdriver was gone. When I turned my hand over I had some trouble, this being a rotary reed valve engine it is capable of running full bore reverse or forwards and it was running reverse, so the sharp edges got me. I lost a knuckle and whacked another finger pretty bad, the tendons were cut in three places on one finger, and 2 on the other. I fell very fortunate to still have them allbeit they don't work anywhere near 100% anymore. SO PLEASE BE CAREFUL EITHER SIDE OF THE PROP.