[Dylwad]

I gave up on the O-rings on my AB nuts from the start, and use zip ties instead for the time being, until I go the Dumpstercnc route~which look fun to install to say the least.

My main problem with backlash now is the helical motor couplings, with the backlash out of the nuts, theres enough drag to slightly twist the couplers .002" or so, My next move is to CA some sheet rubber around the couplers, and wrap that in heat shrink, the other option is Disc type couplers, at $100+ a set.

BTW I found a neat cheap trick for keeping dust out of the slots in the 8020, 1/2" caulk backing rod from Lowes or HD slips right in, and looks good too, and MUCH cheaper than the covers from 8020.