Elegoo Mars Z-Axis Adjustment

My first publication.
My first print with the Elegoo Mars showed me that I had a deviation of 1.6mm at the calibration cube in the Z-axis.
After I noticed that the Elegoo Mars has only a fixed holder for the light barrier for the Z-axis I decided to create my own adjustable construction.
After the production and the assembly of the unit shown here I could adjust the Z-axis exactly.
Note:
For the exact adjustment I took out the resin container and put 2 sheets on the LCD. Then I adjusted the holder so that it runs out without any force on the Z-axis.
Then I let the Z-axis move upwards by 0.1mm and set Z=0 via the menu item Set.
The following calibration cube had a measure of 20.01mm, this was repeated several times with the same result.
I hope that this construction can also help others to set the perfect Z-axis.
Suggestions from you are welcome.

Translated with www.DeepL.com/Translator