Hephestos frame, Z axis adjuster Bottom

I wanted to be able to push or pull on the top of the frame in order to adjust the Z axis geometry.

I remixed part from these things to fit my frame and allow push/pull effort (without having to drill the frame: the top part just clip on the frame)
https://www.thingiverse.com/thing:1588579
https://www.thingiverse.com/thing:1449320

There is 2 top parts because I wanted to have the more possible space between rods (in order to be sure there will have no interference with the construction p