Last week when I was researching the topic of removing the clutch off my McCulloch TimberBear I came across a picture of a piston (don`t remember the make of chainsaw) with a hole towards the center caused by a metal piston stop - thin metal in the piston.
I chose to use a 1/4" braided rope and pushed in about 3" towards the sides (sides are the stronger part) of the piston as the piston was coming up in the direction the clutch nut will be removed (clockwise on the timberbear) and then the clutch was suppose to slide off except it was gummed on the axis forcing me to build a clutch removal tool like some of the tools described above to break the glue-like gumminess.
Rope worked both times for me to stop the piston to remove the clutch nut and then the gummed-on clutch.
I chose to use a 1/4" braided rope and pushed in about 3" towards the sides (sides are the stronger part) of the piston as the piston was coming up in the direction the clutch nut will be removed (clockwise on the timberbear) and then the clutch was suppose to slide off except it was gummed on the axis forcing me to build a clutch removal tool like some of the tools described above to break the glue-like gumminess.
Rope worked both times for me to stop the piston to remove the clutch nut and then the gummed-on clutch.