The problem is likely that the tube material is brittle. I think I am familiar with the tube material you are referring to. I know I had similar problems when I used the stems of hollow Q-Tips.
What I use now is truck air-brake hose that Dana buys by the 10 or 20' roll from an auto supply shop. The stuff is black and can be a body for a dark fly all by itself. I use it for most of my tubes. I have recently used some very fine diameter graphite tubes that a rod designer friend of mine gave me - it is very sweet material - but I don't imagine it will be widely available.
If I were you I would switch from the brittle tube material and try to find a material that is a little more supple.
Tight lines - tyler.
Still Living Large!
Last edited by kush; 02-26-2003 at 01:51 PM.