The worm/worm wheel interface (which is what your efforts have addressed) isn't the whole game: There is the motor gearbox, for example, along with any transfer gears between the
gearbox output and the worm shaft (if applicable).
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I'd bet, given your efforts, that the motor gearbox is the culprit. Short of replacing it, while hoping for a better gearbox, your best bet is to try Paul's suggestion.
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The way I get around it, not having a newer mount with the spring loaded worms, is to very slightly miss-align the polar axis and then slightly miss-balance the DEC axis.
That way the DEC guiding motion never reverses. Same idea as biasing the RA balance eastward since the RA never reverses when guiding.
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That way both worms are always in contact?with the worm wheels and are moving in one direction when guiding.
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Mark Christensen
