Made a little more headway by getting the Treadlevac's booster cylinder clean and just about ready to go! I am having a hard time believing that these were originally raw bare metal without rusting away but that's what several have said. I may give it a coat of gray brake caliper paint just for piece of mind as it's the closest I have to bare metal color.
The original casting, as I mentioned, was heavily corroded but the replacement of course, is not so I'll use it. I wish it had been made with the Bendix and Treadle vac (as the original had it) logos but I understand that patents and probably copyrights prohibited it.
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