Tripod mount for HS-422 servo motor

I wanted a pan/tilt head for my webcam, and I already had two servos with a pan/tilt bracket, and a raspberry pi/miscellaneous junk to control them. My pan/tilt bracket doesn't support the bottom servo, so it's not stable without a better base. I figured attaching it to a photography tripod would work well, so this model was born.

I tried using the OpenSCAD thread library to build the threads into the bracket. After the first print didn't fit the bolt, and the next few scaled prints weren't q