Thanks Phobby,
Great job, you saved me a few bucks. I always used mine to fill tires. It did not leak when it was at max pressure. as soon as I dialed it down it would just drain the air tank. Mine has never been wet. I was surprised with the amount of corrosion inside the regulator.
A couple of things to add:
The screws under the label are torx not sure what size but an allen will work.
the nut is 15mm
I used some white grease during reassembly.