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There is a set screw in the gear box to adjust the play. Turning it clockwise
takes slack out of the gear. It is just a trial and error method. You dont want it tight enough to bind the gear. It should turn very easy with a small screwdriver while you wiggle the top panel up and down.
I dont know if you actually took the gears out of the gear box or not, but there is a tiny ball that goes in the gear box at the end of the worm gear. If the adjustmen wont take out the play, this tiny ball may be missing. Voice of experience and lesson learned the hard way.
Hope this helps. Dan
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