Originally Posted by stefanj

I had, but never "assembled" or flew, a Yankee 1.
It had one of those yellow plastic T-25 cones with the ridges and removeable T5 cap. (The cone could be used as a T25-T5 coupler of sorts.) See a picture of the Martian Patrol to see what the cone looked like.
The American Flyer models had a replacable liner tube; a length of T20 with punch holes to lock it in place. I don't recall if the company sold replacement liners.
The series "reusable wadding" was a red plastic plug that slid loosely along the liner. I don't recall the attachement details. An image of the instructions would be revealing.