If you go to the section of this website that provides detailed information on how to repair old Sturmey-Archer hubs, you’ll find new content on the K-series 3-speeds of the 1920s and 1930s. Not all the material is explicitly about repairing the hubs but it may prove useful and interesting to some readers.
There is now an 18-page PDF file (zoomable and easily printed) that includes all the following content:
- The late great Jim Gill’s description of the type K hub and the changes made to it during its production run (2 pages).
- A cutaway drawing of the 1922-1933 model.
- Jim’s simplified instructions for dismantling and re-assembling the type K.
- Jim’s analysis of the type K’s “no intermediate gear” feature, which went AWOL in 1935.
- Jim’s tabulated analysis of 20 type K hubs manufactured between c.1925 and 1937 (2 pages).
- S-A’s 1925 parts list and exploded diagram of the type K .
- S-A’s 1935 exploded diagrams and parts lists for the type K, type KS and type KSW hubs (5 pages).
- S-A’s 1937 exploded diagrams and parts lists for the type K, type KS and type KSW hubs (5 pages).
Go to the Cycling tab above, click on Gears and scroll down the list to “How to repair old Sturmey-Archer hubs”. Or just click on this link: https://hadland.wordpress.com/2012/07/02/how-to-repair-old-sturmey-archer-hubs/
Update 22 June 2016: I’ve also added material on the K-series brake hubs (KB, KC and KT) and on S-A’s 1930s drum brakes (BF, BR, BFT and BRT).