I have reached a point I dont want to put in any hard cash into this machine. If I had other machines I might up grade to new srews and figure out something with the nut.I rewatched your video and i noticed the assembly on the end of your lead-screw is totally different. You may have a newer machine than mine. My lead screw measured just a few thousandths over 3/4”, so I plan on using a 3/4”-10 Acme trapezoidal thread tap. I don’t see why this wouldn't work at all. I’ll bore a hole in the work piece, tap it, then mill off half the nut that I don’t need. What diameter is your lead screw?
Or maybe even a ball screw set ? I just dont have the money to bother.