I bought a cheap $50 spring compressor off of eBay which is designed for Mercedes springs. It did the job, but after using it about six times, the threads appear to be stripping, so it's probably at the end of its life. I was even careful to grease the threads well.
I also had to enlarge the access holes for the front springs.
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DON'T MESS WITH MY MERCEDES!
1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles