Tablet shelf mount arm

An extension arm for mounting this very helpful Amazon HD 8 mount on a 19.5mm shelf:
https://www.thingiverse.com/thing:3211112

It's handy for hanging a tablet within eye's view from a shelf over your project desk while working on your various and sundry projects. I use it with my Amazon Fire HD 8 over my soldering desk. Drill a screw hole through the top shelf grip for extra stability.