At the Melb meet on Monday we were talking about this. I found the link to Jin's tutorial on how to do it:

http://www.angelfire.com/mech/jinsao.../Megatron.html

I want to try myself but don't have a dremel. Jaydisc suggested on Monday we use a knife. I'm an utter klutz so as much as I wanna try I want to know if anyone has tried it yet? Otherwise I think only Turtleboy has done it but he's all the way up in Albury/Wodonga