What it sounds like you are saying is that the basket pulley is not solid on the engine crankshaft. If that interpretation is correct, well it should NOT move once tightened down with the allen screw. If the pulley hub is moving on the crankshaft, your square key must be sheared. On the other hand, if the hub is solid on the crank and the pulley moves, then the hub/pulley weld must be broken.
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