What are universal joints?
Universal joints in the context of these housings are devices to mate the control shafts in the door of the housing with rotating controls on the Telonics unit. Each U-joint consists of two chrome-plated brass collars and a white nylon piece which joins the two brass parts together. The brass parts are attached to the control shafts by setscrews, and the nylon part is a snap fit between a pair of brass pieces. The U-joints allow a tool-less (after one-time initial installation) removal of the Telonics unit from the housing.