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Sounds good...except I don't see this nut.
There's a plastic piece at the bottom, as mentioned before, but it a cylinder shape and doesn't appear to be able to unscrew.
Could they have changed the design prior to '85? Inside the plastic cylinder (it's maybe 1/4" long BTW) is a metal piece that has something sticking out the center and a slot that looks like a slot for a slotted screwdriver, except that it is interrupted by the part that's sticking out. The part that's sticking out doesn't appear to be a check valve or anything; it won't move at all.
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