I wasn't the one actually lowering my car. I just found the article posted elsewhere.
Yeah, the tool is expensive, but I bet it can be rented, since it is carried by Matco Tools. You may have to do a little research to find out where. But purchasing it may come in handy especially for those of you who can't decide what spring cap to put on. With the tool you can try out any spring cap combination you want, in the time it takes you local tech to just put the springs in once.
Just think of it as another reason why you bought a Mercedes. To own expensive tools