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Great news! I finally managed to get the dam thing open. Those inverted palnuts are really tricky, but luckily I only had to remove them from 2 of the six control knobs. Heres the trick: Find a nut that will slip into the palnut(I just eyeballed it), and then I drilled through it while the bench vice was holding it. Basically, I had to drill out as much of it as you can without having the nut fall apart. Guess and check, redrill, get it so it slides all the way down the bezel. Next problem: I had some trouble getting it to slip all the way into the inverted palnut. Turns out the threads continue a little ways up from the valley of the palnut. Solution: bigger drillbit, but I only drilled about half the way up the nut for this one, so its kind of like a counterbore/countersink.
With the drilled-out nut properly seated in the palnut, its really easy to get it out with the needle-nose pliers.
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