Here's a view of the innards of a Super-Flex joint. It is held together with a C-clip on one side and a threaded insert on the other. A set screw locks it all together and a zerk provides greaseability. It's a good idea to purchase the Super-Flex joint spanner tools (two sizes fit all joints) along with your suspension kit. They fit any 12-inch drive ratchet or breaker bar and make rebuilding the joints much easier should you ever need to.