Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
That looks simple. I'm thinking though that the caliper has a metal insert at the bottom of the thread for the nipple to butt up against, it's a sort of conical hat affair IIRC. Or maybe I just imagined that bit, been a while since I've done one.