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I've experienced some horrible noises on my homemade mount also. I use a Tamaya brand 4201 to 1 reduction gearbox and motor for the Azimuth drive. A feature of this gearbox is the ratchet clutch built into the first gear from the worm drive off the motor. Should I jam the drive, the ratchet clutch will slip so no damage is done to any part of the drive, thank goodness!
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