So Sylvan's screws arrived today and I just checked 'em out against the gun. I got the camera out and everything, but what really is there to see?
Sure enough, the pilot on the screw I pulled from the bag calip'd at 0.104, several thousandths thicker than mine.
I popped the old screw out, the new one in, and lo and behold, I could feel some resistance while tightening it. In fact, I decided it would be clever to tighten the screw with the cylinder open so that it would be less likely to drive metal off of the yoke button where the screw holds it tight in the closed position.
Voila! No more yoke endshake. Tho it turns out that I can tighten the screw to the point where the cylinder doesn't open! hm. So the snugness will probably keep it in without driving it down all the way. Some locktite might be a good idea, tho that will be irritating come cleaning time. For now I'm going to give the gun a go - maybe next weekend's IDPA. My usual centerfire range is closed for the season.
This seems like a super-easy fix for a gun with a worn yoke button, and now looking at it closely, and dragging a fine tool across its bearing surface, I can see that it is indeed worn. The long-term fix is clearly to either replace (eek!) the yoke or to do the poundy fix to peen it back into a better position. But for speed, cost, and risk, these oversize screws are hard to beat.
All I did was swap a screw, but I learned a ton!
Thanks, Sylvan!! I'll send the other two screws back to you in the baggie.
-Daizee