I am trying to find out where the popping and loose motion is coming from under my 300 sd. I jacked the car up and tryed to compress the spring with an ampro compressor tool. It seems that the spring is attached on the bottom. I thought the spring just sat in there and when I compressed it it would come out. I stopped and felt I needed to ask the experts for help and advise. What holds the spring in place? How do I check? Thanks in advance Jack