Feed screw thread

But if it's heavily worn, the threads will take on a triangular shape, as the above appears to be.
That is my thought also. The gullets appear wide and flat bottomed like acme. You really need to figure out how to take a better picture.
 
They threads are 1/2 - 10. I made a test screw and it worked perfect.

Well if that is the case, and they are not acme, you will either have to single point thread the nut or make a custom tap.

Have you tried the dealer to see if a replacement was available under warranty?
 
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