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Don't know if it will help...and don't let yourself be photographed while doing it...
You might try using a small enough Phillips head screwdriver, as a stethoscope- handle to the ear! (I've seen mechnics use extension bars, screwdrivers, and such to isolate mystery noises in running engines. This is safer- no moving parts!)
Put the point carefully, but solidly on the headstock. generate the noise, and then move it around to different spots. You should get it louder as you near the source. If not it will make for interesting pics at your next party!
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