This was attempted but fell right off after the bolts were tightened with the allen key. The crank does not stay on at all anymore
Are you saying the pinch bolts on the crank arm will not tighten? The axle splines and the interface for them in the crank look good enough.
The pinch bolts do not tighten, they are also worn out the allen key will sit and once you attempt to tighten it comes right off
@Howard started
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This was attempted but fell right off after the bolts were tightened with the allen key. The crank does not stay on at all anymore