One thing I didn't notice in this excellent reassembly advice for the 1903 Colt is the fact that you can not finally, fully insert the combination safety knob/hammer axis pin into the frame UNLESS THE HAMMER IS COCKED. In other words, after you wiggle the safety pin to start it into the frame, but get it most of the way in, you THEN have to cock the hammer, since the safety only installs through the enlarged cutout in the frame when it is in the "up" or "safe" position, and it only will do that if the hammer is cocked. Additionally, I found the hammer hard to hold and push into position against the mainspring pressure, until I used vise-grip pliers on the top of the hammer (and no, the pliers didn't mar the hardened steel hammer).