[QUOTE] No. Freddie Frith on a 500 Norton. Obviously well screwed together :-)[/QUOTE] The people at the factory screwing them together well in those days.Given the tolerancing limitations of the technology of the day. They made up for that a lot by matching components by hand prior to assembly. The castings and forgings were superb. If you went to a sand casting company these days, and asked them to cast close finned iron barrels for an air cooled bike, they'd tell you to Halve the number and double the thickness.