This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
From: firstname.lastname@example.org (Iskandar Taib)
What you want to do is get your hands on a reinforced cutting wheel
like the House of Balsa Tuf-Grind. The Dremel ones tend to shatter and
throw pieces at high speed. If you use them harden them with thin