Micromake Heatbed holder

I just buy a heat bed for my micromake 3D printer, but supplier don't provide holder, so I design a new one, it can adjust the heat bed balance at 6 point,

Parts list :
This holder X 6
M4 X 30mm X 6
20mm X 7mm dim. Spring X 6
M4 X 12nn with washer X 6
2020 use 4mm T nut X 6
M4 square Nut X 6