here is a site with how to build one; http://webpages.charter.net/rcfu/ConstGuide/MCM.html

I used a MAc header, which the overall length was 8'' of just header.
Can is 2 1/4'' in diameter, about 10'' long.
Stinger inside diameter was 1/4'' and about 3'' long.

Hope this works for you.

dave hauch