I recently acquired a cheap Atala road frame, with the intention of building it up as a single speed. This is a bike-boom era frame, built for 27" wheel with plenty of clearance for fenders, so there was no way my old Dura-Ace calipers would reach the rear rim. After pricing official drop bolts (more $$$ each than I paid for the whole frame), I decided to make my own.
I looked at Sheldon Brown's page on home made drop bolts (http://www.sheldonbrown.com/home-drop.html), and decided I could modify it a little. So I made a quick 'n' dirty "proof of concept" model -- about 20 minutes, start to finish. I'll probably go back and make a prettier one now:
http://www.os2.dhs.org/
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John (john@os2.dhs.org)
Appleton WI USA