Compress spring for a guide rod mount replacement on a 126?

I just ordered the guide rod mount to replace the one on my 87 SDL that is totally shot. From the manual (for the 123, I get my 126 manual next week, but I bet it is similar) I can't tell whether it is possible to install it without compressing the spring. One post I saw seemed to say that it was possible, though not easy. Does anyone have any experience with doing this installation?

I will also be replacing the upper control arm which appears not to need spring compression. If I am wrong, anyone is free to tell me. Always better to know before you get it apart.

thanks dieselers

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84 300TD - 235k - Farbe "Surfblau" bought at 213k
87 300SDL - 131k - Farbe "PimpGold" bought at 115k
00 Klepper Faltboot Expedition Double