I wish I could say I did it. The blank comes precast with the tube inside, it includes the pen kit. You can get it from: http://www.arizonasilhouette.com/
Bill charges $19 for the package. It is about half way down page 2 of the pen price list as Sierra Vista Circuit Board pen. Don't forget the bushings. I first showed it last Wed, and already have orders for 8 at $65 each. Gotta order more kits.