I have had MB jacks tip over (not on me) twice in my lifetime. I always use a chock now, if I have to use the MB jack. I found cool little MB folding metal chocks on eBay, for very little money, and have added those to my cars' toolkits.

I was not under the car at the time! Sorry if I was unclear before I edited my post. I'd never get under a car on a jack.

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David
1986 300E Anthracite + ECodes + MB Mileage Award