Hello, international3414. You have to read the Patent claims, difficult as they are to understand. It has something to do with "covered" leaf springs. I believe, if I read it correctly ,(what are the chances of that?) , the corkscrew looking end would work its way into the "covering" to allow a graphite type lube/grease to get between the leaves. Again, this is my interpretation of Patent Lawyerspeak , (not sure if that is really a word, where is Bill H.?) Regards, Lou