Always used them when I had a 123; always use them when I lift the 124 and 210. However, I then put a jack stand under the pad and take most of the tension off of the jack. The jack remains in the jacking point as a backup and as a convenient place to "store" it until time to take the car down.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970