The reason is that I, several months ago, bought a original set of 531 SL tubes. The other day, I bought this very neat set of lugs (with Campy short horizontal dropouts, regular non eyelet ones in front) but they are "racing angles". I'm 63 and don't race but I ride horrible distances at a time (C ++s).Then there are two upcoming auctions for Nervex lugs. Most of my Motos have Nervex lugs. It will probably be a certain R.S. that builds the bike for me but I thought that I would fill in my ignorance with THIS wonderful Bikapedia. That's about it. About 5 people have been helping me off list and I am very grateful for the type of people that populate CR.
John Redman
Hapeville (Atlanta) GA