There are a few things we are having trouble with. Firstly, this is the barrel elevation mechanism.
We have a slight oil leak from the bottom of the vertical column. We are not sure if this mecahism is supposed to run in an oil bath or actually be full of grease. It's possible that over time some of the grease has liquified, or that someone put oil in it and then topped off with grease. If anyone has some information about how this is supposed to be lubricated I'll be very happy to receive it.