Help-does anyone out there know what the threading is for a Mercian seat tube bolt-screw(1977 vintage/)??It looks like 7mm,but I don't know the threading-I have an assortment of spare nuts-bolts-mainly MC stuff-but they don't fit(more than 1.5 gently turns).I took it out years ago for some dumb shi! project,and it is gone.I emiled Mercian,but I don't expect a reply.Thanks.Charlie
I thought the diameter was 6mm,but it is more like 7mm.