Hi Brent -
I was able to test the new motor mounts last night, and they seem to have worked well.? We had a nearly full moon, and poor 2/5 seeing conditions, but nothing jumped out at me as an obvious problem.? The mount was happily guiding at .8 arc-sec rms at 23? above the south horizon.? Fairly challenging conditions to guide through, for certain, so I was quite happy with anything under an arc-sec.
I think I'll wait for you to test the brackets out as well, and if they work for you too, Ill make them available on Thingiverse, along with the spring loaded worm components.
Thanks,
-Tony