Constant Force Springs

[@TimpBizkit]

A bigger version are in those wind up radios from about 2000. Though it would coil the spring in the opposite direction and it would uncoil and go back to the oringinal coil.

[@evren.builds]

where did you find these from btw?

[@corylowe5557]

thanks

[@anissbenthami]

Can you explain the working principle of it?