Sturmey Archer Indicator Pin/Chain
There are various lengths of Sturmey Archer indicator pin, depending on the length of the axle. Here's a chart which is useful if you have the old indicator pin, and you need a replacement (because it's bent or broken).
|Sturmey Part||Mark||Spindle length||Length to mark|
Thanks go to the late, great Sheldon Brown for the information in this table, which is an abridged version of this table (which you should consult if you don't have the old pin and you're not sure which pin you need for your hub).