X axis idler for FLSUN Cube 3D printer

This is a new mount for the X axis idler (H wheel as referred in the documentation). It provides for X belt tension adjustment, and sets the idlerl at the same height as the X motor spindle. It butts up against the holders for the two X poles, which take the pressure from the X belt tension.
There is also a small bush to fit inside the H wheel to convert the 5mm hole down to M3 screw diameter.
The mount uses the supplied holder for the H wheel which slides horizontally in the grooves on the