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Lapping compound is a fine grit paste for polishing metal/cleaning up rough surfaces.
That crankshaft is galled.
I bet at some point that key broke, as that is the result of the flywheel spinning and wobbling on the shaft, while grinding fine pieces of broken key against it.
 

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Gotcha. Will do I have files in the arsenal of tools. Kinda weird how the flywheel doesn’t have anything to tighten it down just gets pressed in place. Man was it a bitch to take out.
It's not weird...it's a 'taper lock'.
The nut just draws it into place, and remains as a safety. It is an interference fit, as once in position on the shaft, the i.d of the flywheel and o.d of the shaft are very close in actual size.
This is why you need a puller tool, and why there is a sudden pop when it releases.
It is a very good design.
Be very careful with a flat file on a round surface, and that is a hardened shaft that material will not easily be removed from.
Take your time so you don't put flat spots in it.
 
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