I am new to the Forum and new to BMW ownership. I am doing a cosmetic restoration on a 1980 R100/7. I read a post about changing shock oil that said the shock spring must be released to allow for pushing up the rod that releases the shock oil at the bottom. I suggests the spring will "pop up" a couple of inches. It looks to me like the top attachment nut must be taken out to accomplish this. My question is do I need to remove the top shock nut to change the oil, and if so, how difficult is it to get the sping back into the shock?