I recently purchased a second hand underpinner, it’s a Minigraf 44. I can’t get any pressure into the underpinner pneumatic system as the air seems to be escaping from underneath the first connection, I think it is the air filter lubricator.
I’ve been through the instructions but have hit a brick wall.

I know it works as I had a full demo when I purchased it, and it came with the compressor.
Does anyone know what might be causing this?
Or...does anyone know anybody that could take a look at it/service/help me set up the machine?
I’m in the south of Glasgow working from home and would be happy to pay for someone that knows what they’re doing to come over.