Re: Bad backlash in just North direction #backlash
There are several good guides available on this type of mount:
These may help, I am sure there are more. With the worm there are two critical adjustments. The worm shaft endplay and the worm mesh. Both are critical. Check the endplay adjustment first, it sounds like that may be your issue.
Adjusting these old mounts is critical for use with OnStep, since it has no feedback. Be sure the entire range of motion is smooth with no binding. These old mounts typically have old grease which has gone solid and can have binding issues particularly if they were left "loaded" with scope in one position for long periods of time.