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Message: <blockquote data-quote="mtngunr" data-source="post: 4379006" data-attributes="member: 46104"><p>Sounds like the rear of crane arbor end down in cylinder worn, allowing cylinder to slide fwd and rub,  where dropping in one or two "end shake bearings" (shim stock-thin washers) would fix it by keeping cylinder back where it belongs...with cylinder dismounted from crane, these bearings would be placed down inside cylinder arbor hole....I think that's how it would go on a Ruger unless lucky enough that model allows placing them between cylinder face and crane...am not up to speed on the Six line....but it a job doable at home. I think it Power Custom who sells the end shake bearings? Take your readings while thumbing cylinder forward and while pulling back to measure what sounds like excessive end shake.</p></blockquote><p></p>