Erik
That’s the one, they were also used on Ariel valve-lifter cables right up to the end of the singles circa 1959.
Its too hot in the workshop at the moment, so I was casually ambling through the Internet for a break when I realised that nobody has pointed you in the right direction on your pump. I am not a 2 speed expert, but this device looks identical in many details to the Best and Lloyd plunger pumps used on an number of early bikes. The idea is that you release the catch on the plunger, and it should rise (by spring power), you then push it all the way down which pressurises the system. You can adjust both sight glasses for number of drips. The plunger slowly rises as the oil goes out until you have to push it down again. I know from experience, that these suffer air leakage on the main barrel washer (a big cup one) and the packings at the various glands.
I can’t post you a diagram on this site because I don’t have the copyright on it, but something might just arrive by private E-Mail. Hope this helps.
Malcolm
