Gearbox & Clutch
The gearbox is a Sturmey Archer CS-TT model. This is a rare box and after contacting Simon Grigson from http://www.vintagenorton.com/ it turned out that this model was also used in early 1920's racing Nortons. The box is notable for close ratios and the lack of a kickstart; in a racing machine this would just be extra weight to carry around. The gearbox is detailed in the catalogue as this and the images of the bike show that too, so it is believed to be the original gearbox.
The spline-drive clutch is a later addition, having been introduced by Sturmey Archer around 1926 and this would entailed replacing the mainshaft from the gearbox as the original clutch was a taper fit.
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