I have experience in both Klann and Kragen style clamp compressors. While the clamp compressor is, as you mentioned, essentially impossible to use for removing a mercedes spring, I was suggesting that the spring does not need to be removed, just safely secured. It is possible, and I know from experience, to attach the clamp style compressor to the spring. It is often not possible to actually clamp it down enough to remove it from its seats ... but he doesnt need to, anyway.