Having seen people throw their money away cutting vees out of expensive copper pipe, I thought I would offer a lo-tech tutorial for making a frustum pattern.
1. You know how long your fustrum needs to be, how wide you want it at the base and how wide you want it at the shnozzle end. Draw the base of your frustum. A frustum is a portion of a cone, or a cone with the tip chopped off. I have marked the base here "A".
