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I purchased one of those a few years ago and w/in a few months, had the same problem.
After some tests w/ my DMM, I discovered a dead short between the main boom and the phasing lines.
Seems that when the hole for the rear rivet was punched, they didn't deburr it.
I ground off the rivet, reamed the hole and replaced the rivet w/ 10-40 hardware.
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