This is a magnetic dovetail system that lets you use a single Polemaster camera on multiple equatorial mounts. The magnets are from Amazon, 8mm diameter x 1mm thick, superglued to the 3D-printed parts.

Ensure that the orientation of the magnets in the mount-side and Polemaster-side parts are such that they attract each other!

The mount-side part is attached to the mount with ordinary double-sided tape.