The one that came on my '72 PX-10 is indeed an ugly zinc plated bolt. I have tried a Campy bolt but the shoulder doesn't go through the oval hole that the original bolt fit into. Since my '68 PX-10 is being assembled entirely from NOS original parts (except the Normandy hubs, I haven't found any NOS ones yet) I would really like to find an original bolt that came on the bike. It is the last part I need to have everything to complete the bike.