"For those of us without a lathe:"
Ya, lots of ways to do many things if your creative in thinking.
I needed a large 1/4" round steel disk with mounting holes, I drilled the mounting holes after rough cutting the disk, then mounted the disk on a car hub, grinder under it, got a perfect disk
Must say I did not think of doing that myself, saw something similar on a forum and adapted the idea to what I needed.