That's likely going to be a make it yourself proposition, unless you can find one from a parts donor. I looked into replacing the bent( but virtually like new, unworn ) screw in my 6x12, and it was $$$$$+++. Talked to Jim at JDS, and he said they made the screw and nut as a hand fit matched pair, and replacement cost was $700. Yikes. So, I took my time and carefully straightened it in my hydraulic press.