As others have mentioned, pictures help enormously. Old Dutch barges can have 'quaint' fixtures and fittings not often seen by many boaters on these waterways. Even on my modern boat i have 2 'greasers', 1 for the stern gland, and another for a gland on my steering. If you haven't already, consider joining the DBA, the Dutch Barge Association. There is a wealth of knowledge on there. I wish you were closer, I would have nipped over for a gander.
I too am on Thunderboat, and also not a troll.