If you dont mind me asking are you talking about a takedown sleeve? I made some, not 100% sure on sizes, my buddy owns a metal shop I just whent in and found the tubing that fit together well then I cut it to size and put it in a press and made it slightly oval so it couldnt spin. Sorry not much help
![Huh ???](http://www.primitivearcher.com/smf/Smileys/default/huh.gif)
Josh