Found it! I read those instructions, and studied the illustration, and didn't see the spring button!
Would've been nice if they had called it out on the illustration, but then it wouldn't be so fun rebuilding this Bird.
Next question: Checking instruments:
How do I check to see if clock still runs?
Are they rebuildable? To inspect the guts, I will at least need to replace the "tape" that runs around the outside of the clock housing. I don't want to take this off until I know better, but I don't see this tape in any of the suppliers books.
The adjusting knob shaft is rusted, and I would like to at least clean that up, but it will be tough without further disassembly.
(This car hasn't run in 25 years!).