Yazzo Triple Rod Mounted Socket

To complete this set, I need a triple socket to match the single and double sockets found here:
http://www.thingiverse.com/thing:7285
http://www.thingiverse.com/thing:7264

This thing gives you three ball sockets that can be attached to a rod.

By default it is designed to slip/friction fit on a 5/16" rod.

This thing, combined with various other ball/socket combinations can make for some very interesting structures.