So I seem to recall that on most props, the spinner backplate is bolted onto the hub with drilled head bolts to accommodate safety wire. Turns out the Whirlwind is different. Specifically the installation manual indicated that the bolts in question are just AN5-4A bolts with a washer. Instead of safety wire, the manual specifies that they're held secure via lock-tite 262.

Lock-tite makes dozens of different formula, each with a specific purpose. some are high temp, some are oil resistant, some are low grip, etc. etc. etc. I thought I'd pick this particular one up easily, but it turns out that this particular flavor is evidently made of a mix of unobtanium and unicorn horn.

I checked Ace Hardware, Auto Zone, The regional parts distributors, Airparts, industrial supply places, etc. The only place in Wichita that I could find which actually had it on the shelf was Grainger industrial supply, and they wanted $66.00 plus tax for a 1.5 oz bottle!

Spruce has it for $23 for a 10 mg bottle, which by volume is even more expensive. What the heck is this stuff?

Anyway, I called Airparts back and they found that they could get the same 10 ml bottle from Avial for 14 bucks. So for that plus whatever markup they put on it, I can wait a couple of days vs. paying over $70 (including tax) to get a 1.5 oz bottle today for something I only need for 6 bolts.

All that to say that If you're installing a whirlwind prop, buy this stuff ahead of time.