Here is a "quick and dirty" wrench I made for adjusting hands in modern clocks (typically, Hermle, Urgos, and Keinnenger). The minute hands on these clocks have a brass bushing with a square hole in the center. Occasionally, you will run across one that does not line up exactly with the center of the time marking when the chimes or strike go off With this wrench, it is a simple matter to turn the hand slightly on the bush, to get it to align exactly.
I used a piece of 3/8" cold rolled for the handle, because that is what I had handy, but the important part is the wrench itself. All it is , is a "cut" nail - you know, those square ones used for nailing into concrete block, or installing flooring? They are super hard, and useful for all sorts of things, from home made cutting tools (just grind the end to the desired shape), to punches for mainsprings. I cross drilled the piece of stock with a bit just large enough to set the nail al the way through, then drove it in until it was tight. A cutoff wheel in the Dremel was used to whack off the excess on the fat end toward the nail head, and then I just ground it down flush on my bench grinder.