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If theyre not the originally matched items , the taper might be a gnats dick out .

You usually check the mateing with a bit of lapping paste or blue , either way .

Any ridgeing radially could be a bother , youd stone it smooth . So Yes , may notve seated ,

Pays to check the retainer threads clear & free also . Really want to lock the Mag. Sprocket rather than

attempting to strech ( a part of ) the chain . SO , the nut shouldnt bind , should wind on past fitted psition unimpeded .

Also the Rear Face of the Nut , & face of sprocket should be free of burrs & distortion . Lap again if in doubt .