i have a problem with my piston.   i have a brand new 45   i was breaking in the engine on the bench when it flew off the bench and hit the ground  breaking my new prop and doing something to the engine.    i picked it up and checked it out.   i noticed that it was turning over but very hard.    i disassembled it and noticed that the cylinder was loose in the housing.   and i also noticed that the piston would get stuck about 3/4 of the way up the sleeve.     i was hoping that someone could tell how it coming off the bench could make this kind of problem