Turns out the AFC grub screw made its way AAALL the way in; I had completely forgotten about the AFC on my kfl+
My problem was the opposite; the farthest screw (dual airflow type) from the filler screw was constantly creeping farther and farther out and needed to be reset a couple times each day. Argh!
So I ordered some locking set screws from McMaster-Carr: M3 x 0.5 x 3 stainless steel, pack of 25 for $11.66, p/n 90251A155. These have a nylon insert that takes up some side clearance and tightens the fit.
Also ordered a hex driver to turn them: Miniature Plastic-Handle Hex Driver, 1.5 mm Hex, 5-45/64" Overall Length, $3.74 each, p/n 52975A14. This also works well for my new allen head post screws.
(dang, these parts is tiny! drop 'em on the floor, good luck finding them...)
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