Also, make sure you are trying to turn them in the correct direction. Being on the back side, everything is reversed from normal.
(I still have to pretend I am looking from the backside and do a little twist of my hand counter-clockwise to get myself situated)
Re: the beeper - on my '79 it was under the tank on the left side, toward the front. There was a short pigtail from the beeper to a connector. I used to unplug mine, and the first time I would forget to cancel my T.S., I would plug it back in for a bit as a form of self-punishment.
Then I got good horns, and I needed a place to mount the relay. I used the tab for the beeper and threw the beeper in a box.