I just received via the great brown truck of joy a 2007 vintage 1858 Starr DA revolver. Nice in that it works smooth right out of the box. Neat design and after going over the parts schematic I've got it pretty well figured out as to the mechanics with one exception. There is a spring attached by a screw to the back of the primary trigger. Part# 19B and called a trigger safety spring. It looks like it can be adjusted up or down. I have an idea what it might be for but figured I would see if anyone who has experience with this revolver can tell me for sure.