Brownell's Zinc Phosphate was the source, though I read of some hardcore DIY people who will cook their own from concrete etch solution and steel wool. I wanted zinc because of the gray appearance. Most of the rest of Bettie Jean's furniture is done in zinc already, and in good shape.
I cooked the parts in the parkerizing bath in a Pyrex casserole from the Goodwill store, heated on a Coleman camp stove. After 15 minutes of immersion, I rinsed the part off with hot water from a 30-cup coffeemaker (damned handy item) then shot it with WD40 while it was still hot. After that, I wiped off then blew off with compressed air all the WD40 I could, and bathed the part in vegetable oil.
After:
Next up, the gas cylinder and rearmost of the op rod.
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