Hello friends, who knows how to work, is not necessarily looking for a longer detour to do it. My PX 200 had a clamp and the result is to take off the cylinder and see what’s going on. I got several hints to lower the engine, which I didn’t like at all. So cover off, cylinder bolts rough, cylinder down and in front of me lay the piston. Locking ring removed and since the piston bolt was stuck, a little thought, in the miracle box crammed and finally found a brass spreader dowel that fit just into the piston socket. This one with a screw slightly tightened until I got on resistance, inserted some WD-40 and warmed the piston with the hair dryer. The pliers taken and then pulled the bolt at the screw like out of the butter, without wasting a thought of knocking or bending. Did nobody ever come up with this idea before me, if you can make life so easy after all? No one has come yet? Greetings Foonmimg