I have a Seneca falls star lathe, it's getting very close to its 100th birthday but I am here to figure out on the threading plate it has an adjustment called a stud and it says 48in, 48out, and 24out. I don't know what or where this stud is I just finished mounting a new motor, the previous one was gravity tensioned and caused major waves in the surface finish. But yea I need to machine an internal thread for a dividing head so I can mount a chuck