Seems I spoke (wrote) too fast. The Odometer came out of skew 0.3 miles after the "fix."

I have put a wire (paperclip, actually) across the posts on either side of the gear, such that it will prevent it from "walking" back out of skew. It is a plastic covered paperclip, so it should be plastic-on-plastic friction when it occurs, and is positioned such that it will not catch on the teeth of the gear, but rather on the hub - so it will not catch on the gears.

Here's hoping that this stop-gap measure will last.

__________________
Lifetime owner
1977 240D

"new" owner
1988 300TE