Darryl.
Do you have a bare splined shaft available the gen pulley will fit on?
If so, you could centre the pulley on the shaft and place the assembly between two hard level surfaces (steel or glass is best) and see if the assembly stays where you placed it or rolls to a different point and stops. If the latter, the assembly is out of balance and has stopped where the most weight is at the bottom.
Seems odd that somebody milled out some metal between the fins on that pulley on the ‘short side’ of the shaft hole. I would have thought that would have made the ‘long side’ even heavier.
David
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