Well, I tried RainX and it actually made it worse! They BOTH chatter and often in BOTH directions. It's maddening. Oddly, they chatter as much or more when it's raining hard.

It may be the bushing - what center cover are you talking about Carson? I'll try anything now.

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer