Once again, Bruce (aka Lucid) is spot on.

Once I actually SAW the rear adjuster lock on the a/c compressor. There really is one, but danged if I could figure out how to get at it.

Last time on belts on my 1988 244 I went (¼ mile) to ACE and bought a 10mm Flat Ratchet wrench. Quality? Dunno, the main feature was that it was quick to get. It is great for the nuts and bolts on the backside of the p/s pump and likely good for that backside compressor adjuster.

For the long long long adjuster bolts, I use a ¼-inch drive 10mm socket mounted on an electric screwdriver (takes an adapter for ¼-inch square drive to hex shape, ACE again). Another big time saver.

Have you got a new belt for the a/c drive? What with all that work to get at it, do the new one now, save the other for an emergency, it's probably glazed anyway.

I found, on my 1984 244 with the York compressor, that a slack a/c drive belt made squeaking and squealing and shreiking like something awful was going on. Tightened it up, got blessed silence.

Chances are good that your belt, once tightened evenly front and rear, will make the squealing disappear (is the audio equivalent disa-hear?).

Good Luck, Hope you can take full advantage of our gorgeous weather. Got flood light work lights? Evening comes all too soon, and worse next week with standard time.

Bob

:>)