FlashForge Adventurer 5M/5M Pro Device for simplifying bed leveling with screws.

One scale division corresponds to a key rotation of 5.14 degrees and a height change of 0.01 mm (for M4 screws in increments of 0.7). You will need an enlarged washer M12 (DIN9021), an open-end wrench 7 and a hexagon from the printer kit. I printed PLA without supports with the scale down (as in the file). The installation sequence is as in the photo, before turning, carefully select the play of the open-end wrench and holding it motionless, turn the hex screw.