GoPro mount for a 16mm boom tripod (microphone or cymbal stand?)

thingiverse

I stumbled upon this tripod about twenty years ago, and it's been sitting around ever since. It's missing its boom, which probably got lost along the way. The only clue left behind is a black steel insert that was meant to hold a bolt in place. At first glance, I thought it might be a cymbal stand from a drum kit or even a microphone stand. But after removing the black insert, I discovered a 16mm hole that's just begging for something to be attached. That's when I decided to create an insert to make it compatible with GoPro equipment; my first project is to mount a laser projector onto this setup.