I'm not sure how the W123 compares to the W126 of the same year. Example: the attachments to the flaps are very similar. With this in mind, can you see how any other flaps are attached to the pod arm? If so, it is likely to be the same attachment method. I ran across this with the center pod and was able to sort it out and devise a method to detach the arm.

Hopefully, someone with definite insight to the W123 will chime in soon.

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Sam

84 300SD 350K+ miles ( Blue Belle )