ROBO3d Bed Leveler ~Revised

The solution for bed leveling with no loss in bed height

It is very simple yet very effective it is simply two hollowed out shafts that slide inside each other that the screw can pass through each shaft has a 2mm base or cap for support the key thing here is that there is an internal spring that pushes the two shafts apart.
as can barely be seen in the images

The problem before with just springs is that they generally have no horizontal support and could allow the bed to shift as the bolt tips the intermingled shafts help prevent this.

This was actaully but together with a spring from a pen but was designed for use with a spring from MCMaster-Carr but could be used with similar springs else where.
The important specs:
Item: Metric Compression Spring
Material: Music Wire,
Length uncompressed: 19mm Overall,
Diameter: 9mm OD,
wire width: 1.00mm Wire-WOW nice and thick should make it stable horizontally
compressed height: 7.5mm
so fully compressed the height will