Thx geeklimit, Yes on test runs I noticed that the adjustment arm occasionally popped out of the router core because the clamp lock was too tight. Spent a while adjusting that until it was just lose enough for free movement without the router core tilting when moving.
Even with the tape, the worm still has drag with the arm, and the spring isn’t strong enough to counteract it. I’ve tried rubber bands and bungees to press the arm’s “tooth” into the router’s cutout, but they can’t seem to handle the vibration the router gives off them it’s cutting.
So you still have the ‘arm’ pop out of the router core ‘cutout’? I will keep an eye out on it.
I suspect if I still have issues with z-axis after these fixes then I will try something more drastic like a variant of the Meticulous z-axis (The Meticulous Z-Axis) which bypasses the whole stock mechanism. The stock mechanism is just not (rightfully) designed for a CNC implementation.
BTW just noticed that this forum does not thread replies so sorry if all you helpfully folk get spammed by my responses.