Locking Plate for Flat Pack Camera Arm

This part is a mod for my flat-pack camera arm design - https://www.thingiverse.com/thing:2266891

This Thingiverse page provides the part files for the camera arm locking plate. I've written a tutorial on the process of how to cast low-temp metal alloys using 3d printed molds up on Adafruit- https://learn.adafruit.com/metal-parts-from-3d-prints/

The process involves common tools and supplies - a 3d printer, silicone rubber, a hot plate, stovetop casting alloy, and a dollar store skillet. This method can be used to cast a variety of materials, from chocolate to plastic, with the accuracy only limited to the precision and resolution of your printer.

I built a camera arm to document projects a few months ago. The joints are clamped down with rubber pads between them to prevent slipping, but I noticed the joint at the base kept creeping down over long periods of time (like while capturing time lapses). I decided to fix it with a locking plate like you'd find on C-stands, but wante