Designed and printed to help out some friends who were on follow-spot duty for their student amateur theatre group ("spex") and had a hard time aiming on the right spot before their spotlights were turned on.
The rail should be compatible with almost any weaver/picatinny rail-mounted accessories, we used some of the cheapest red dot sights we could get on Aliexpress.
You need 3 magnets that are 40mm in diameter and have an M5 internal thread. We used some 40x8mm pot magnets, and a couple of M5x10mm screws to mount them.
On the inside, you need another magnet that is 10x4mm, which is to be glued in to hold the adjustment hex key for the red dot sight, so you always have it on hand.
The author marked this model as their own original creation.