This item may interest the curious.

An anti theft wheel used in urban supermarkets to deter the homeless from stealing carts. The concept operates similar to a radio dog collar- when taken beyond a buried antenna loop, a battery powered brake is applied.

I offer this wheel recoved from a metal scrapyard for your experimentation.

All the socket screws are slotted to take a regular screwdriver and already loosened. The locknut on the axle is hand tight too.

Inside are a 9-volt battery, radio reciever, hobby motor, cam and worm gear, and spring loaded shoe.

More information is available at http://71.6.196.237/fravia/nola_wheel.htm for system architecture specifics.