PHOTON Leveler
Undo your leveling machanism (don't lose screws). Using this plastic leveler, re-assemble using the 4 screws from the bottom. Insert long bolts thru holes from the top. Screw them into the top of the build plate. Let build plate hang. Insert nuts into slots. Screw thumb screws into sides of this leveler. Now the forces of tightening the head in place don't alter your build plate leveling process.
You need these to tighten the plate:
(nuts go in slots and screws go in nuts LOL)
(4) M4 x 0.7 Hex Nuts
https://www.mcmaster.com/91828a231
(4) M4 x 0.7 Plastic Head Thumb Screws
https://www.mcmaster.com/96016a559-96016A117
You need these for the vertical head movement:
(undo leveling mechanism and run these thru the LEVELER into top of build plate)
(4) M3 x 0.5 hex head screws
https://www.mcmaster.com/91292a314