Tony - I'd say it's 'pretty' tight, I'd estimate maybe 0.5mm of clearance (very rough guess from last time I had it apart).? In fact, I tried to make use of that wiggle room on the DEC axis to move the base plate as close as I could to the brass bushing since, no matter how much I tried to tighten the mesh of the worm to reduce backlash, I could never create a stall condition (as a reference point to back away from when loosening the mesh).? So moving the plate in principle brought the worm closer, though I don't think that experiment did anything meaningful.
Keith
