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Ducati Meccanica
Posts: 2,263
Join Date: Aug 2003
Location: Wimbourne, Dorset
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The dome (narrow end) should grip the inner bearing race. The wide face against the swingarm to spread the force to the ally.
The left hand swingarm cap has an edge michined off to clear the nuts on the sprocket carrier. The RHS (brake) has lips on both side.