My old bed leveler design allowed too much movement of the bed plate, so I re-designed and simplified it to utilize the screw holes in the 200mm print bed and increased the bed stabilization, which improved print quality dramatically. You will need 30mm or so screws, nuts, 2020 extrusion nut + a small screw to lock it down and a spring, I got my springs out of dead inkjet printers, but they are pretty easy to find.