Headset mount (top of stem) for Lezyne GPS computers

Another remix to work on my skills with importing and editing STL files into Fusion 360 while preserving design history. See my [Blendr mount](https://www.thingiverse.com/thing:3374028) for more details on how I accomplished this.

This design is intended to be used under the stem topcap and above the stem to mount a Lezyne GPS computer.