Heya ronjon,
I've never done a cooltube before but as requested I'm stopping in to say hey... I was thinking if you had access to some glass-cutting equipment you could get one of those glass jars that's the right dimensions to store pasta, and cut the bottom off. You can use a Dremel tool, but you have to do it under water or at least wet or it will crack and the wheel will burn up too fast.

I tried emailing you.. I'll try again!

ps big thanks for the amen thread... my head is getting big though, lol!