DIY coupler tube?

[billdz]

I recall a post several months ago that mentioned a DIY method of creating cardboard coupler tubes. Could someone give me a cite to that post, or suggest a good method for making these tubes?
Thanks,
b

 

[billdz]

I found a couple of videos, one by Apogee and the other by John Coker, which show how to make a coupler by cutting off a piece from the body tube. I would like to make a coupler without using a piece of the body tube, if possible.