Amal Tuning Book: how to install and adjust Concentric carburetors on classic British bikes such as Triumph Bonneville, BSA Lightning Rocket, Norton Commando
In the 19th Century every British factory which needed to bolt something to something else devised their own fasteners to do it. Clearly, this caused all sorts of compatibility problems. So, along came Mr. Whitworth (I forget his first name right now) who invented a standardized system of coarse threads (with 55 degree thread angle and rounded roots and crests).
