@uncle_bob:
My simplest idea to eliminate backlash.
A set screw pushes apart two halves of a partially slit nut.
A ball nose spring plunger set screw applies a constant anti backlash force, (2 to 5 lbs force).
Additional ball nose spring plunger set screw can be added to increase the force.
You can still clamp a bracket to the OD of the nut, and use the flange.
Drawing is to scale for a 3/4 X .500 Right Hand Hi-Lead lead screw nut.
[www.roton.com]
Slit the nut.
Drill a hole in one half, and tap it (10-32), (don't drill and tap the opposite side of the slot).
Assemble a ball nose spring plunger set screw into the tapped hole.
[www.mcmaster.com]