This is a mount for the Lerdge and AstroBox touch screen, it was a few parts hacked together. There is a glue block to brace the dovetail center if needed by just glueing it in place on the back. If you want to use the Lerdge knob a hole will need to be drilled or edited and the spacer used.
If you use the pi/touchscreen side taller feet will most likely be needed. The feet I made are as follows: https://www.thingiverse.com/thing:3356209