Without going down for a look, I couldn't say how many oil connections are on the mechanical lubricator off the top of my head though it is a later addition, from recollection the maker's plate had a 1930s or 1940s date on it.
I think the item I've pictured does have a drain cock out of view, possibly controlled by the lever on the right and I'd guessed that the one on top controlled the amount of steam getting in to the chamber to operate it?
Anyway, I'm going to be working on site in a fortnight's time and I need to get photos of various bits, in particular the cracked slide so I can get some idea of fixing costs, but I'll put some more up here.
Follow the horses, Johnny my laddie, follow the horses canny lad-oh!