Thanks for the detail. I reset M92 so i can do backlash first. I am doing the test you outline in Is there a better way to calibrate? - #20 by brent113 just using the dial meter instead.
When I do +/- 0.1 mm step on the Z i am basically getting same lower and upper number on the dial meter for each cycle of up and down - seems perfect.
When I do 0.01 custom movements (as you describe in your good / old post) i am getting results i don’t understand.
Up takes 2 click before there is movement. A subsequent down then takes 4 clicks.
I get the same result in reverse after i do the above. aka 2 clicks of the button moves it down, but 4 clicks is required to get it to move up.
Is my backlash 0.02 or 0.04?