No help to anybody here but fun - My Peugeot UO-8 that started my journey on road bikes in 1967 died on a car door 25 years later. The plain steel seatpin got tossed in a box. Then I realized I was getting tired of fussing with my Campy bolt which 1) was lousy with the brake cable hanger I used for my Mooney's cantis and 2) over time broke because of the poor fit with that hanger. "Duh! I've the right pin! Pulled it out, cut it to size and used it for the next 30 years. Now honorably retired.