eBay and Craigslist finds

These look incredibly dangerous to me. They appear poorly engineered to me with the torsional moments created by braking acting laterally against the clamping forces of a single screw, plus the odds of one of the brackets coming loose are multiplied by four times. Anyone who has had even a computer sensor go into a wheel will know how dangerous it can potentially be. I would hope that these are bought as museum pieces only!!!

I would agree- def better ways to clamp brakes- but you have to enjoy the lovely over-engineering of them- looks like the kind of things worked out in a pub and knocked up the next week. You could always have them on the bike just to 'look' legal ;)