Starting the next generation Fitbit Cheat-O-Matic, but changing the name, switching to proper high-end bearings, and make a sturdier base and cam follower mechanism. Should be slick if everything fits nicely and plays nicely.
How do those super-cool Disney "Glow with the Show" colorful glowing mouse ear hats work? I try to figger it out by tearing one apart. I can tell you it ain't WiFi.