My rear sight removal/installation/adjusting tool is a brass rod 5/16" in diameter and 4 1/4" long with one end tapered down to 3/16". That and the right hammer and I'm all set. The best part is the price, which was nothing. One day at work a guy I knew was working in the crib where all the bar stock, etc. was stored. I asked him if I could get a piece of brass rod and he cut it off for me. It may leave a small brass mark on the sight, but if it does it scrubs right off without messing up the finish on steel sights. If they were aluminum or plastic it might be a different story.