Edwin's saxaphone ligature takes two 6-32 screws. One of them broke, so I made a replacement. I started with 1/2" diameter steel rod. I think it was zinc plated, but that wasn't too critical; whatever plating was originally there was removed.
I started by turning the portion to be threaded to 1/8". Since the length wasn't too critical, I just used the good screw to figure the length.
I threaded the end by hand. (I could have used a geometric die, but the setup would have been longer...)
Once threaded, I turned the shoulder that separates the threaded portion from the handle.
The shoulder actually tapers a bit, which I did with the graver.
The handle is a rounded ball, which I shaped with the graver after using a parting tool to remove most of the waste.
Here is the part next to the broken screw after parting.
I removed the leftover spigot by reversing the screw in the lathe -- good thing I have an 1/8" collet.
Now the handle is ready for final shaping.
Since I had to remove lots of material, I figured I could either spend time with a file or the bench grinder. The bench grinder seemed like the better option (it may not have been any faster, actually). I gripped the part in a pin vice so that I was securely in hand.
I ground both flats with numerous breaks to dunk in cool water...
After polishing, hardening, tempering, and final polishing, here is the final product in place.
The handle is a little wider than the original, but it does the job.