Hevo bed height adjusters

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/1J8amLI3cLv

The bushings cover the spring inside.
The large bushing has a M3 nut inside to lock it firmly against the heatbed.
The small bushing is hole through and function as guide for the spring and the large bushing.
As all is captured there is no wobble of the whole system
The thumb screw uses a M3 nut.

Printed at 0.2 mm with 0.4 mm nozzle with PETG at 245/80.
Infill 23% honeycomb.
No supports needed.
Parts needed.
4 x M3x50 hex screws
https://www.banggood.com/nl/10Pcs-M3-x-50MM-Cylindrical-head-Inside-Hexagon-Screw-For-3D-Printer-Accessories-p-1029182.html?rmmds=myorder&cur_warehouse=CN

8 x M3 nut

4 x spring
Outer diameter: about 8mm/0.31''
Inside diameter: about 7mm/0.27''
Line diameter: About 0.6mm/0.02''
Height: approx. 20mm/0.78''
https://www.ebay.nl/itm/10pcs-Strong-Springs-for-DIY-Ultimaker-Makerbot-Heated-Bed-Platform-3D-Printer/401470663451?ssPageName=STRK%3AMEBI