Hi everyone, I've had this gun for over 20 years and have shot it a lot, but haven't done any shooting for several years.  That's fixin to change!  Blue 8" heavy (non-ribbed) with Pachmyr Presentation grip.  Needless to say it is my favorite gun and the most accurate handgun I've ever shot.  Sweetest trigger too.  I just got the tool set and a new ejector rod, and while studying the cylinder-to-barrel spacing I noticed that the cylinder will move back when I push it by depressing a spring detent in the back of the frame.  When setting the barrel, I assume it's set with the cylinder in it's relaxed position?  I read that .006 is the max spacing, but the cylinder is not perfectly square in the frame so I thought .002 - .003 on the tightest cylinder would allow for expansion and keep the loosest cylinder within the .006 spec.  I would appreciate input from someone who knows more about the guns than I do, all I've ever done is shot it and I want to dial it in before I start shooting it again.