I would be very suspicious of the initial alignment. That bushing is visible with just a casual glance into the wheel well of a W126!
The other concern is that you mentioned this problem on the drivers side and the shop said the problem was the idler arm, which is on the passenger side. Yes, I would be very suspicious indeed! If you really want to try and make the money good, find out if they have another front end technician and when he is available. Otherwise, you might be better off counting it as water under the bridge and money lost and locating another shop more reputable for work on MB's.
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Sam
84 300SD 350K+ miles ( Blue Belle )
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