RE: Cox Crankshaft Disassembly
When I disassembled my Black Widow recently, I found it much easier to remove the prop driver by placing the crankcase on a block of steel rather than a block of wood.
When using wood as the backstop, it absorbed much of the shock from the hammer and the driver wouldn't come free. By placing on a block of steel I could use much lighter blows and it came off really easy.