Trolley lower bar replacement for Gotway ACM 16

This is a replacement part for the original trolley of a monowheel Gotway ACM 16

I realized a different bottom hook to replace the thin aluminum bar of the trolley (very light and weak) to have something more robust and aesthetically nicer.

Edit 5/04/17: Added a new version, with the rest support. Now the wheel can stand alone, without having to rest against a wall.

Edit 13/06/2018: Update; I added two new files, they replace the previous version "with support". I have strengthened it