I came up with these links:

http://www.wallbike.com/content/butchering.html

http://www.bikeforums.net/showthread...s-bondage-pics

I've tied two B-17's. Initially I used a hand held leather punch which worked fine . The second saddle seemed to have thicker or tougher leather which the punch wouldn't cut through. I was forced to use a drill. Either method seems to work.