Sugino Mighty Tour made a million of them, I had a Campy NR for years. Now it has a Willow triplizer with 110bcd. I made my 1st one from a Nervar Star, about 1974. The 1st ones took the Stronglight outer chain guard off and put a small wheel on the inside, using the long bolts. Can be fun on mild terrain, as you have a bunch of mid-high gears close together.
Dickey Greer
West Monroe,LA USA