Workshop question: An L. Dubrulle oiler

Normally on a Wednesday, Jos van Genugten will give you some technical advice and shows what he has done in his workshop. He is working on a 1899 Amedee Bollee and this time, he is asking you for advice;

In the workshop, there are often parts or systems that are incomplete, non-functional or not properly mounted. In those cases, we have to find out how something is supposed to work, why it doesn’t work now and how it should be mounted in order to work.

In today’s case I have a L. Dubrulle oiler. This is a system built from just before 1900 to....