Wanhao Duplicator 4X leveling feet

I wanted to keep my printer stable and leveled and didn't find anything out there so I made this. I used some o-rings I already had (Ideally one would use domed rubber footings). I used a robust 20mm-4 trapezoidal thread. Works well for me.

3D printers aren't perfect so you're actually getting threads with tiny steps, so when assembling, screw in the foot into the bracket 1/4 to 1/2 turn at a time then back off some and screw in another 1/4 to 1/2 turn until you're all the way through (Like t