Tell us about yourself!
How to Make a Wiggly Seal
I suggest haveing some stones to cover the holes when not in use.
He's triggering the switch with his phone so he can turn something on and off from a distance not in the same room. Porch light, pet feeder ...
Adding angle-iron mounting flanges bolted into the sandwich and using screw clamps or bolts would better stabilize the machine so you could focus on grinding.