For a new split nut, I dove into my stash of old CNC router parts. I replaced the lead screw with a 1/2-10 ACME thread that is coupled to a Dumpster CNC anti-backlash nut. The holes in the leadscrew supports is 1/2", so they did not need to be modified. The mount for the anti-backlash screw is from an old CNC build.
The clamp is holding a small piece of Lexan that is keeping the metal chips out of the anti-backlash nut. I still need to mount that permanently.
It works great....other that I cannot disengage the lead screw to back up the carriage. I also have to manually put he drive belt on and off if I want to do automatic feeding.