Here is the motor, worm, and drive gear of the DS-10. Adjusting it is very simple. Two allen bolts on the back of the housing plate (not visible in the images) loosen to allow the worm block, which is all one piece, to be moved closer to the gear, largely resolving the backlash problem. The motor is attached to the worm block, so there is no chance of losing torque or creating tension by adjusting the position of the worm. The three screws on the face of the round plate adjust the clutch. Tightening the clutch helped with the backlash, too, and the slight slipping I could feel as the clutch grabbed. Even I can adjust such a simple machine.
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