The AC in my w123 300TD has been working great since last summer after I serviced and recharged it.

Recently it has been working intermittently, i.e. it will cool for a while and then seems to stop working. Additionally it has been noisy and occasionally lets loose with an awful squeal that sounds like a slipping belt.

I got underneath today and took a look at the R4 compressor and found what I think is a broken part of the clutch assembly, although I don't know the specific names of the part(s) in question.

(see pic below)

There are three arms coming off of the triangle at the top of the clutch. These three arms attach to a thin disk under the triangle. One of the arms has broken the attachment to the disk. I can actually push on the disk and move it out-of-center.

Is this outer layer of the AC clutch replaceable, or do I need to replace the entire clutch and/or compressor?