"gardenlen" wrote in message
...
g'day al,

in good quality machines there will be a service tool to screw in the
spark plug hole and act as a stop. but it does sound more like that
the clutch is screwed onto the crankshaft.


Those of us who are "of an age" Would feed yards of string in though the
plug hole to stop the piston. But be sure to leave the loose end hanging out
:-)

Steve