Under handlebar mount for Bontrager Transmitr remote for lights

Using my Transmitr remote mount, I realized that the location on the bars was okay, but not perfect. Think about the location for a front derailleur or dropper post - it's under the bar. So, I went to work to create an under-bar solution for the Transmitr, and here it is.

If you have a dropper post or front derailleur, you might want to go with the [original on-bar design](https://www.thingiverse.com/thing:3451563) but if you've got the room, I find this one falls under the thumb easier.