I got a old Power Kraft lathe from a buddy who inherited it for a relative who passed away. The screw that runs into the tail stock must have gotten bent and mangled up at some point. It's been cut short and is in rough shape. I plan on replacing it but am stumped. It appears to be two way threads or some sort of cross thread. I was curious if anyone could tell me what this is? Why they used these threads vs standard? And what is the best/easiest option for replacing it?