This may be old hat to some of you pros, but this is something that I have found quite useful when working on firearms. I was putting a ruger 10/22 trigger back together today, when I thought of a tip that might be useful to others. When you are putting a part together that is comprised of several different parts utilizing the same pin, if you don't have the correct size slave pin, (as most of us never do)use a dowel rod, or a wooden match or toothpick. You can either cut or sand them down to the right size,put the part assembly in place, and then just push the temporary pin out with the real pin.
Proud member of the NRA
When I do good, I feel good; when I do bad, I feel bad, and that is my religion.
If I had only known, I would have been a locksmith.