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Hi. Just got back from a short vacation to see my niece married off. I am starting to feel old... Anyway, up till this post, I had never heard of a model A, but, in an old manual, I saw the breakdown of one. Single piece bronze rod running on a simple eccentric type crank, ball bearing at the flywheel end, and a bushing at the rear. A single steel valve plate with two finger-valves. Looks to be a pretty sturdy and simple design. Parts might be an issue, but as I have never worked on one, I can't say for sure. Manual looked like it was from the '60's. The "regulator" is probably a suction unloader which closes off the intake of the compressor to make it stop pumping, as in a gas drive application. From what I saw in the manual, it looks like it is adjustable with a set screw and lock nut, which is probably fed from the tank of whatever it is running on. Suction unloaders are kind of rare on recips, and I have only seen them on IR's. Seems like drawing such a strong vaccuum in the cylinders would be troublesome if your rings aren't up to snuff. I guess IR knows better than me, considering they've been at it for well over 100 years now.
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