Came with a 10" Atlas lathe, the threads match the spindle threads, so it could be attached to the spindle. Has a funny looking collet in it. I've got it soaking in penetrating oil and hopefully can get some parts of it to free up and move. Almost looks like a lever collet closer that threads onto the spindle, but there isn't anywhere on the machine to attach it to, and the collet type is unknown. Suggestions?