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Tony
There is one other thing I can think of that might be causing the problem, take off the worm cover and have a look at the Oldham Couplers, there is a known problem of them becoming loose on the shaft and causing similar to what you are seeing, use an allen key and tighten the small grub screws, 4 of them from memory. While the cover is off, have a look at your worm and see if it is moving in the worm blocks.
JohnG
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