I've been snooping around and found Sunking builds with this switch but don't see any info as far as how to do the mod. I would like to give it a try, anyone able to help out?
If you mean true bypass or buffer effect switching, then it will be the same as this - kind of depending on your original wiring.
http://www.madbeanpedals.com/forum/index.php?topic=5238.0