It was kind of a non-issue in the end. The way the knob is secured on a threaded shaft, the knob was unthreading, rather than opening the valve. I added a star washer and all is well.
Hmmm, I wonder if that's what's going on with mine. When I open my valve, there's an initial friction, then almost a full turn of absolutely no resistance, then I hit a wall. Then I slooooowly turn from there to fill. It's like there's this weird dead space.
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