Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Good luck with the slipped disc op. Make sure you drill the steel disc later, not the boney ones.
Dp you really need that on a 45 year old, 400cc, vintage motorcycle, which I assume is going to be used on a public road? If it's just for looks and an engineering exercise, I wish you well. If your riding/driving needs these types of brakes?