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the only thing I did to the screw after cutting the two counter-rotating spirals out of it was round the end joins a little so the direction transition wasn't so sharp. As you work on yours, you might consider smoothing that transition even more to avoid binding at the direction change, but mine works quite as is. Once I realized the latching (detent) leader/follower bearing track in the inner nut it worked 100% with no false-reverses.