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Here's a quick run down that works for me:
1_ get the scope out and decouple the motor (oldham coupling) so you can turn the worm by hand.
2_ Take the worm cover off and loosen the two hex screws holding the end blocks so they can move/rotate.
3_ Squeeze both end blocks together (against the worm ends) so there's no play, and use the worm cover as atraverse to make sure the blocks are square and in-line.
4_ Mesh the worm against the gear and tighten up the end block on the gear box side. Then tighten the other one.
5_ Turn the wom by end feeling any hard spots across the whole circumference of the gear and note for tight spots. Release the meshing by moving the end block so it runs smoothly. Whenever you do that use the worm cover to square the end block before tightening it and make sure you also squeeze it against the worm.
That should get you in the ball park.
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