Hey, stupid question...

Is it possible to tighten cylinder gap by shimming the yoke to frame joint. I realize that the retention screw undercut would need to be re-fit. I'm thinking that that would be good for a few thou before the crane would bind on the frame. I'm also thinking that this would be alot easier and quicker than setting the barrel back one turn. PLEASE correct me if I am mistaken.

Interesting idea, but here are a couple of things to consider. The fit of the crane on the front of the frame will be compromised and the seam will be offset. Also, you are pulling the cylinder away from the back shield. I am not sure what effect repeated firing with a gap between the extractor pivot point and the shield would have on the gun. Also, will the center pin still work correctly to lock and unlock the cylinder/yoke assembly, since you are pushing everything forward?

How would this tighten up the gap? Wouldn't it simply force the yoke forward, leaving the cylinder with the same amount of fore/aft play and cyl gap as before? There's nothing on the yoke that pulls the cylinder forward against the barrel.

OK, your going to have to forgive me... Being a machinist, I all too often, mistakenly, believe that I can fix anything. To answer the counterpoints brought up, in the order they where.

Glowe, Yes the seem is slightly moved forward. I put a 2 thou shim in and now I can barely catch a fingernail on the seam. By the extractor pivit point I assume you mean the stud that extends into the shield. (Technically, the center pin.) Or do the nubbins that the hand bear on actually bear against the recoil shield? I'm thinking no. Because of a small amount of end shake being acceptable. As far as will the center pin still opening the latch... Yes, it does. Now, mind you that I only moved it forward .002. I had that much play in the yoke. I also took .006 end shake out with shim. (Bangor Punta 34-1 that has been shot ALLOT!)

mmcw, If the whole yoke moves forward, all that is attached to it moves with it. any for/aft play is a separate issue, (end shake) and easily delt with. I'm thinking that the cylinder release catch spring pushes the cylinder forward. Please keep in mind: I'm thinkin, not knowin.

mmcw, If the whole yoke moves forward, all that is attached to it moves with it. any for/aft play is a separate issue, (end shake) and easily delt with. I'm thinking that the cylinder release catch spring pushes the cylinder forward. Please keep in mind: I'm thinkin, not knowin.[/QUOTE]

Perhaps I'm not following you, but if you're trying to reduce the B/C gap by pushing the yoke forward, there's nothing on the yoke that limits the rearward travel of the cylinder, so you cannot reduce the B/C gap that way.

Wrong approach. Being a machinist , set the end shake @ .001 take measurements,set the barrel back one turn,set the barrel gap,cut and polish the forcing cone,shorten the ejector rod the amount of set back.
Right approach another job done properly.

mmncw, You are following me just fine... I just got lost in the woods. Rearward travel is arrested by the recoil shield. Again... My befuddled thought process. (Thanks for hanging in there and continuing to state the obvious.)

yamadeal, Clear, short, and to the point. Thank you too. (Kinda like my mom slapping me up-side the head and asking "What's wrong with you?!)

In any event, if you somehow move the cylinder closer to the barrel then headspace will increase prolly beyond spec. Cutting the shoulder on the barrel one turn is the only way to do it.

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