The "bug in the glasses" speculation is interesting, but I agree with the original poster - the tap was the device William P. Moran demonstrated at the expo. This makes complete sense both logistically and metaphorically:
*Logistically because 1) Martin Stent (Harrison Ford) could have purchased it when he visited the expo, and 2) it's the easiest to use - no breaking-and-entering to plant a bug.
*Metaphorically because it limns Harry Caul's primary failing - his vanity. He was arrogant about his own skills to the point of being dismissive of others ("since when is William P. Moran of Detroit, Michigan preeminent in the field"), a fatal flaw that cost him in the end when he failed to recognize that he had been bugged by a device he previously dismissed as "junk".
I've listened to the commentary track as well, and it frankly shocked me that Coppola didn't suggest the bug was the Moran S15.
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