Bought it used at a gun shop on consignment. I like it so much I might get a 634 off Amazon.
I read that proper barrel pivot adjustment is to tighten it enough so that (after cocking) you can place the barrel anywhere in the return arc and gravity won't move it. The Slavias have a scalloped barrel pivot screw head. There is a keeper screw that rests in one of those scallops to keep the barrel pivot from turning out of adjustment.
Modifications listed by number as shown in the attached photo:...