I tweaked the fit and got things working great. You slide the locking nut over the ball, then clip the socket on, then quarter turn the nut onto the socket to lock in place. Next up, design accessories to attach to the ends of my little system. Another caveat, I am a spoiled brat with access to a nice Stratasys 3d printer with soluble support. Can someone with a trifling rep rap or makerbot try printing this and let me know how it fares?