STEMFIE 500% to GridFinity 1x3 Baseplate Adapter

For those using CHEP's idea for the STEMFIE kit, scaled to 500% for building furniture and fixtures for your shop, and using #GridFinity, here is an adapter which will allow you to mount a 1x3 GridFinity baseplate to the top of your STEMFIEx5 project. It connects to your STEMFIEx5 beam or brace using three holes. The holes in this project are threaded, so you only need a STEMFIEx5 screw which is extends about .25 units beyond your beam or brace.