For example, CaDA builds a universal joint using aluminium sleeves, a copper center, and steel pins to join everything together.

The new Super-Flex U-Joint from Tom Wood was built with rockcrawling in mind and allows for more flexibility than a conventional joint! Read more inside Four Wheeler Magazine, ...

Connective joints are "design projects in their own right", according to the curators of the huge U-Joints exhibition during Milan design week.