It's not my fault, Rob, it's Nortons. Mine is a '75 with a rear disc and apparently if both discs were on the same side, they went round in ever-decreasing circles under braking effectively imitating the oozlum bird before presumably disappearing up their own exhaust pipes or something like that.
Players number 10s..I remember them well...They were from the days when smoking was still good for you..(and would get you a nice girlfriend and an exciting lifestyle).. ...How times change...Ian