The first change was in favor pulling the Diacomp G with new brake calipers. I tried many starting with Campy Monoplaner, the Dura Ace 7700, Shimano 600 dual pivot, and Had to settle for whatever was the best reach. It turns out that Dura Ace 7402 has more reach than any of the above.



I ended up pulling the center pivot bolt from a tektro 536 to convert the 7402 to nut mount

Of course in the process I ripped the 7402 apart and the tiny pivot bearings got well, spread about. After an exhaustive search all were found.