>>Still, I dislike even thinking of having to do that.  Even when they pick up the shipping tab it's still a pain in the tail to deal with when you should be out shooting it.<<

We're not in disagreement there.  It definitely does suck.  Unfortunately, I've had problems out of the box with half of my new guns including Ruger, S&W, Springfield and Marlin.  It's an annoyance, but minor in the life and use of them.

>>The shim I'm using for the Wolf reduced power mainspring is from the screw on cap of a 16 ounce aluminum can of Coors. The width of the shim looks about the same as the barrel/cylinder gap of the revolver.  Besides adding a bit more pre-load to the spring  it also provides a flatter purchase for the strain screw tip on the rib portion af the Wolf spring. I just checked on the shim when cleaning the revolver after Saturdays match and it's held up very well for a couple hundred rounds and some dry fire.<<

I've seen shims used before.  They worry me for whatever reason.  Not sure if they'll work their way out.  I've used all of:  slightly bending the mainspring to adjust tension, or a longer set screw fully seated and loc-tited, or a loc-tited set screw, depending on gun and intended use.  The first two are more desirable for reliability, but the loc-tite hasn't failed me yet either.

Todd