Bike rack mounting bracket adaptor

This is a bike rack light mounting adaptor for a Portland Design Works Danger Zone light with a clip. In my design the release clip broke off, but there is a lot of friction between the hex nut and the light so it's held in very well.

I found this design
https://www.thingiverse.com/thing:8947

Which referred to this one that had an openSCAD file I could modify.
https://www.thingiverse.com/thing:226475