My W124's trip odometer doesn't reset to zero. At some point I will attempt to remove and disassemble it to see what is causing the numbers to just dance around when I try to reset.

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.

Well, in my 126 the push button acts on a metal arm that pushes against a spring, and the number magically return to zeros.

Perhaps the amount of travel of the metal arm is not enough?

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----Adam

1985 300SD 322,000