I think frame-mounted sconces work better.

The first attempt (uploaded as "blink1SconceFrameArch1.stl") is much more stable than the PCB-based mounts.

Problems with this first attempt though:

* mounting arms block some of the side-emitting light

* mounting grippers are 2mm too wide on each side

Thus fixes to try:

* move mounting arms forward towards USB jack: gives more space for light

* eliminate 2mm space on grippers