Summary

Attach the hex key to a motor shaft with adhesive, attach wheel to hex key for mounting. Use flat surfaces on wheel to add up to four display models that pivot on the wheel. Works best vertically, with a slow turning motor like for turning holiday ornaments on a tree.

Wheel diameter 3"
Width 1.5"
hex key 2"

This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/bbQ1wjuy8s2