Problematic Fully Functional Wheel Assembly

This is PFFWA - The Problematic Fully Functional Wheel Assembly
I have made a fully printable problemtic wheel assembly. I started to play around with some wheels because I wanted to learn how to design and 3d-print the attachment for the wheel. I ended up with an attachment that works for the 3d-printed wheel but with no clue how to use it whatsoever. What should I use it for?

The assembly has three parts:
1. Wheel attachment (the part you attach the wheel to)
2. Wheel
2. Wheel spring 2x (you print 2 of these and stick them into the wheel)

I played around with the wheels after one of my plastic bins with wheels brooke. I did not want to throw them away. I had four wheels and ended up with an attachment that worked. But now I do not know what to use them for. I am not in need of another bin with wheels. I thought of maybe make some sort of massager. The wheels feel nice to my skin. Or some sort of stress reliever? They are fun to spin around for like 15 minutes. Maybe they ca