i have stripped the auxilary pump body under my tank
as you (hopefully) can see there are parts missing
I wanted perhaps to use this as a chain oiler with manual control so wondered what the piston was like and if it was sprung or had other valves etc
but mainly I wonder what the internal layout is like since the hole marked with an arrow seems to have a brass end deep inside and the
end with the olive (LH) is blocked as is the cable hole in the ferrule at the RH end

if images are not allowed
The image can be found at https://www.flickr.com/photos/showspace/6378501731/in/photostream