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Hi Robert
I actually had the same problem my backlash was over 200 steps on the fine adjustment side . I pulled the focus assembly off and the 4 grub screws that apply pressure on the rack and pinion weren't set properly .The 2 grub screws on the fine focus side were screwed in two far so the rack and pinion were not mating properly. I now have a backlash of 30. Works a treat now .
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