That is right, but im getting 1-2mm at the end of my CW bar fully extended with all the transfers in place surely yours should be in the order of magnitude 1/3rd that amount which should be well under a mm.
With my worm gear/wheel adjustment i have the motors out and with my finger turn the worm gear. I do one complete loop and you will find the tightest spot and adjust for that. essentially this will give you the tightest meshing and minimal back lash that your setup can achieve.
I aim to have it so that i can turn the worm gear just it cains your finger a bit but works a treat.
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