I made a puller out of 25mm thick high carbon steel plates and 25mm stainless studs & nuts (like a bendix compressor) with facilities for twin & multi bladed props. "They come off with that !" Sometimes a bit heat is needed. In all cases you really need to use grinding paste to bed the new prop in. The grey marks left on shaft & prop indicate the fit and if necessary the prop needs to be spun quite a bit. When bedded on 100% it won't shift with a good key & castled nut.

That fit is all important, if the thing wobbles it will pop off in time.

www.johnhansen.co.uk

SAILING ! (there's worse things you can do with your life) <;-)