Something to think about, my 71 which has worn out several other mechanical items is still on its original bushes. The cam does not spin free, in these bushes when cold until not just the case fasteners are secure , the barrel must also be bolted down, before the barrel is bolted the cam will turn but not so free. The gist of this is, if you are having the cam bushes line reamed fit the barrels to the cases first.
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