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Peter,
Can you remember, when you loosened the 1/4-20 bolts, did the (not sure how to describe it) 'unit they were screwed into' (UTWSI) move? It's this movement you use to bottom the Worm gear teeth into the Worm Wheel teeth, and then tighten the bolts up. The reason I ask is that I am going through the same adjustments (just to make sure mine is adjusted properly) and on my RA assembly, the bolts were already loose but the UTWSI is unmovable! If yours is/was unmovable, you would have had virtually no effect on the teeth mesh and therefore your backlash. Do you want to give it a quick try? Loosen the 1/4-20 bolts and see if the unit can move back and forth.
Charles
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