Bojan have you thought about using toothed belts and pulleys. I have them on my EQ6 and there is no discernible backlash. It also gets rid of the 'microjumps' that gearboxes give you. With the side by side, SN10, guidescope, finder system and fridge there is about 70lbs of payload. This guides very well when there is no wind.
You can see the amount of counterweights needed in the last picture.
Bert
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