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Hi Roger,

All very true words and I just wish I had more time at the moment to dedicate to the cause.

On the engine with the loose cup, had it bashed the bore in the crankcase into an oval? It would seem that as soon as a small amount of clearance is available then the engine forces will quickly ensure the clearance grows rapidly. The worst example I’ve got is a two speeder that was so loose on one side it broke off the retaining ring lip in small parts due to the impacts. The hole was over 20 thou larger than the cup in the vertical, and around 10 horizontally.

I’m building up two at the moment actually, one for the Moss cranks and one for the Silk ones. I’ll be installing new cups in both so I’ll make them to size. I took the old cups out to vapour blast the cases.