I picked up a load of old clocks recently and have managed to hook one up with a small motor to get it to run backwards.
Its not perfect, I need to refine the drive belt, which is just an elastic band I have cut and then tied together. I cant access an axle without taking the clock frame apart to loop a belt around, so cutting is the only option.
I plan to build it into a mantle clock facade to hide the workings and battery, then just have a simole on/off switch.
Let me know what you think and any ideas for the build.