@deckingman I do agree with that. I started with 3 screws, but it introduced a slight amount of play that I was not happy with.

So in RRF3 I would be able to level XY only using the BL Touch?

I was always one to have the latest and greatest software versions, but now that I am 55 I under stand the principal of "If it's not broke, don't fix it!"

@deckingman well let me rephrase that, mine is not going to twist. I tried several coupler styles and found that these couplers worked best to keep the screws centered with little or no wobble. But they will pull apart.
https://www.zyltech.com/flexible-plum-coupler-shaft-various-combinations-from-5mm-to-12-7mm/

I have a 600mm x 600mm print bed using 4 lead screws. The bed is made of 8mm machine plate aluminum which is NOT going to twist with a 4 screw auto level. I am trying to find a way to level just on the X and Y axis. I have searched quite extensively this forum and the web and have not found any way to do it.

Equipment:
Duet 2 wifi + duet 5
firmware : 2.02(RTOS) (2018-12-24b1)
BL Touch.

My least preferred method would be 4 end stops at the bottom of the Z travel because its 1300mm with single start 2mm pitch lead screws.

Actually my least preferred method would be to install RRF3 if its capable of doing what I need. But if its my only option....