I guess I was spoiled with the trim in the house. Most of it you could flake the layers of paints off the old shellac surface, raise whatever was left over with the heat gun, then wipe it all down with Howard's Refinisher. That's because nobody bothered to prime it first.
But somebody did prime this door, and the paint wasn't letting go. It certainly wasn't yielding to chipping, heating, or the refinisher on a steel wool pad. So I'm trying Citrus Strip for the initial removal. I might have better luck with Kleen-Strip or Strip-Eeze or something like that, but I'm working in the basement and the ventilation could be better.
The Citrus Strip is supposed to raise all the layers between an half hour and twenty-four hours of the time you brush it on. Ha. It bubbles up the first layer of paint beautifully, but for the two or three under that, repeated applications only seems to make the wood soft so it feathers up whether you're using the metal stripping tool or the plastic scraper.
For that matter, I observed that one side of the door (the side it's been hardest to strip), had orbital sander marks in it. Which tells me that it's been stripped before.
I'm thinking that the biggest reason I couldn't get those screw cams to budge was all the paint in the slots. It's out now, mostly.
Can't do anything more with it tonight. The chimney tech's coming tomorrow and I had to clear out the sawhorses and door parts down the basement so he can get to the water heater flue to put the new liner in. Excitement.