Good evening,
Amazing what can be accomplished when you start with a plan and take your time.
Obvious human error in this one. Don't know where I erred but it had to be me.

The moon was my target and the test setup was the original Celestron visual back, with a spacer/adaptor that came with my Bintel 2" diagonal. Not really sure why it was there, I think it was to connect the diagonal directly to the focus back. Anyway, its about 30mm long, and a 32mm EP was used to check where the focus point of the mirror was. Which was about 10 turns clockwise from the stop (fully counter clockwise). See photo #1.
Inserted the reducer into the path, at the focus back. Focus reached at approximately 8 t (CW from CCW stop). See photo #2
Connected Moonlight focuser directly to focus back, focus tube racked all the way forward. Mirror focus was achieved at ~8 t CW. Racked the focus tube all the way back and the mirror movement was approximately 1 t CCW. See photo #3
Installed the reducer in the focus tube, focuser racked all the way out and short flange installed. Mirror focus achieved at ~6-7 t CW.
I did look through the scope without an EP and managed to get focus with my eye at roughly 5 cm away from the EP holder (visual back), but I didn't count the number of turns. However I can say anecdotally, it was about the same number of turns as with the EP +/- 1 t.
So all appears to be working correctly so far. I ran out of time so haven't captured the number of turns with focuser and diagonal. I'm expecting it to be considerably higher, between 15-20. Hopefully I'll get that done tomorrow evening after work. Then on to the camera and making measurements to see what I need to make it work, hopefully nothing as it should work. Still going to order the proper flange to use with the reducer, might make a difference although I don't readily see how it could.

for everyone's input. I'll put this one to bed but will update when I get the flange and test with the diagonal.