In case someone else has the problem, here is a hint. My new Resound Enzo 3D started to give feedback almost continually unless I turned it down to the minimum volume. I discovered that the plastic tip that screws on to the aid and leads to the ear mold would not tighten all the way. The internal thread of the tip was stripped where I guess I had tightened it too much. I tried several fixes: hot glue (that worked well for a day or 2), various tapes to cover the “leak”. Finally, I turned to teflon tape that plumbers use, and did what they do: wrap the tape for 3-4 turns around the thread on the aid and then screw the tip on, which was now tight, and it fixed the leak. I used small scissors to cut the very thin tape to about 3 mm wide.
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