I had problems with the lead nut binding and making the screw very hard to turn. Other blogs suggested running the nut back and forth using a drill to turn the screw. That did not work and in fact made it harder to turn! I was about ready to get the correct size tap and re-cut the threads in the lead nut, but decided to look inside the lead nut first. I could not get a photo of the inside but it was packed with debris most likely from the original threading. Running the nut up and down the threaded rod will not clear the problem. I took a small needle with a slight bend and manually cleaned it out. Then I used compressed air for a final cleaning. TADA !!!! It now works like a champ.
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