Thanks JFawcett.

I think I'm getting enough pressure from the reservoir, but just so I can make sure, how much should I be getting?

That makes sense with the black switch. I was always trying to do it with the door open. So I should close the door to try and see if that works or not.

As for the hinge part, should that be screwed very tightly to the door frame, or should it be pretty loose and rotate easily?