I recently picked up a 640-3 as part of a trade deal. It has good timing, but had a little too much endshake, about .004 which I think is way too loose for a .357.

I corrected the endshake with endshake washers and after that the B/C gap measured .010 and the headspace was .063.

I noticed that the extractor was below the rear of the cylinder and wondered what would happen if I put the endshake washers under the extractor instead of under the crane. Well I tried it and now the extractor is flush with the rear of the cylinder, B/C gap is .006 and headspace is .067, still in spec.

Now I need to ask the experts, is this a valid fix? Does anyone else do this or should I put the washers back under the crane and live with the large B/C gap?

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Ron
NRA Life Member