GlassPacks exhaust, How to?

Anyone gutted their exhaust and created glasspacks? Looking for a how to..... There's a couple of threads on using bolts and washers to create some back pressure and along with it, a better sounding muffler. Also heard of people creating glasspacks, and wondered if anyone here had done it successfully.

Heres how we did a Honda
http://hondashadowacetourer.yuku.com/topic/3482/Gutted-my-spare-mufflers?page=1

ROD

We used to repack our dirt bike cans, but they're made to take apart (hmmm....DING!)
Depending on what type muffler you have, it can be a real bugger to a.) get the stuff in there, and b.) keep the stuff in there.
One idea I saw somewhere lately was someone wrapped their inner baffle with fireplace door rope. I'd think that would last
almost forever.