Mike Noel wrote:

I pulled it out of the tray and the only candidate I noticed was an
unlabeled white nylon screw on the bottom of the radio. There is also a
small round opening in the front plate on the left with what looks like blue
plastic behind it. It is also unlabeled.

There are two small holes in the front of the Ky-97A. One (which you
already know) is used to unlock the unit from the tray. The other is a light
sensor for the dimmer circuit. Do not stick anything in there. It's very
sensitive and easily damaged.

Can't help you on the sidetone adjustment.

John Galban=====N4BQ (PA28-180)

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