The Dubro Ball Link 4-40 Bolt On #180 3-piece ball link set is readily adaptable for many linkage hook-ups with the ball joint action helping to eliminate binding.
The ball is threaded for 4-40 rod or bolt. Threaded coupler is 3/4" long with 3/8" of 2-56 thread for up to 0.072 wire and a self threading nylon socket.