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I've swapped out the front springs on a W108. The ideal way to do it with the axle in the car and having a small V shaped saddle for your floor jack welded together.
You put the saddle up against the inner control arm support to take the tension from the spring and then remove the four bolts that hold it to the sub-frame. As you let the jack back down, the spring expands safely. With a little planning, you can position yourself so that the kingpin stays between you and the spring, lest something go awry.
When you go to put it all back together again, a really long 3/8" extension rod can guide the inner support back to where it belongs if you first thread it into a bolt hole for the inner support and then the hole in the subframe. It's been about 20 years since I did that little trick. I kinda recall putting a socket on the end of the rod so that stayed in place with gravity taking over.
-CTH
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