Quote by controlliner:
"Place the crank case on a wood board andtap on the screw head with a hammer,(gently).
If you use the wrench method on the retaining collar (to remove the prop drive), the wrench will gouge the collar badly and make a mess. It will also crush the phenolic thrust washer in between."

The Drive washer is a press on fit correct?

If this is true then a certain amount of pressure in PSI or the equivelent measure in Kg/cm is required for removal. Correct?

If the above is true then wouldn't the proper tool as mentioned above provide only the amount of pressure needed for removel and no more. I have never gouged any of my collars though even the proper tool, when used improperly can damage whatever you are working on.
I have never 'crushed' a thrust washer yet but if I do I will be sure to let someone know.

If anyone can tell me why the wrench was designed with that particular shape other than to use on the collar, let me know! Yes it will fit the glowhead but it does not provide as much leverage as the proper end with two tabs to fit the head shape.

Anyone know how much pressure is required to crush phenolic material?

Robert