Gyroscope puzzle

I made this gyroscope looking puzzle to enter the Brain Teaser Puzzles contest.

You can play with the dimensions (parametric table) but be careful with the width on small diameters because the “key” can be blocked and the puzzle unable to be completed.

To make a puzzle you need:

• 5 x half moon with studs.
• 1 x half moon with grooves aka the “key”.