I have a set of Koni shocks that i got a little while back and tonight i pulled them out to take a look at what all the hype was about.

So heres the question, How do you adjust them, I see that theres a arrow with a plus on one side and a arrow with a minus on the other. I turned them a couple times and i didnt really notice a difference to them. Did i do something wrong or is there some trick to this?? Or with age does the adjustability go to crap?? They seem to have a good amount of pressure to them. By the way they are from a 87...
Thanks for the help,
Jason