I made this really fast because I ordered a glass bed and realized I didn't have anything to mount it with. Most glass beds are either 3mm thick or 4mm thick so I made a base for each. The pivot is universal and goes on either base. You have to remove the old build plate material so it is just bare metal or it will not fit. If you are having trouble with tolerances, put a washer in between the base and the pivoting arm to give the bed more room to fit under the arm.