[Im4yotas]

http://geek.casaforge.com/code/newform_m.php

Use this. Print it out, cut on the line and trace it onto the tube. May take a bit of grinding to fit up good since it's on a bend.

 

[Im4yotas]

Go to the link I posted, enter the info. Print out the graph, cut it out and roll it around the tube. Same as the toilet paper roll I guess, but it already shows where to cut it and is made to fit around the tube.

It's not rocket science, just cut til it fits. If you cut too much, you gotta start over though :flipoff2: