Thanks Sugarwood
 

Yes , i did enjoy that, really good----regards.

While not my 911, I learned my lesson with our '85 M-B 380sl with a VDO speedo a few years ago. Hit the reset after a oil change and boom stopped working. I bought the replacement gears and like others here have said, the gear didn't break but was so soft and mushy from 30 years of being coated in that lube it broke free from the spindle.

This is what the replacement gear instructions stated:
"The reason the original gear or gears have failed is that they are made of urethane and lubricated with petroleum grease. This combination breaks down the urethane into a waxy substance which flakes and breaks away. This will also leave a waxy film and deposits on the shafts, gears, housing and peg on the pods."

I replaced my gears a while back. I hit the reset once a year to commemorate and track the new driving season. Ridiculous I know. Just don’t want to mess with that fussy little mechanism again!

When the gear "breaks" it always happens when you push the reset button. The fact that you're moving is merely a coincidence. Mine broke, engine off, stationary, at the gas station. Although it's fixed now, as a precaution I'll never reset it in a gas station ever, ever again.

In this example, it’s more rebunked. & no matter how many odometer gears you’ve repaired, don’t allow experience to contradict a Latin phrase.