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I find it interesting that the lateral adjustment screw doesn't move the block as a whole further / closer to the main gear - rather it makes the worm act like a swing-arm with the part of the worm closest to the screw moving further than the opposite end. Doesn't seem quite right to me.
I hadn't actually looked that closely at the meshing to see whether the worm was being pulled down too far when you tightened the mounting screws - on the other hand, it does seem to be working pretty well as it is, and I am reluctant to go messing with it. Next time I have to take it apart to regrease I will make sure to check that.
I am not sure there is any easy answer to your question in the OP. The design simply does not allow you turn the worm directly once it is in place. You could try doing it through the gearbox - but you wouldn't get the right 'feel'.
Adam
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