Hey guys I'm new to the site and have a question reguarding rave valves in a 98 XP Ltd. Thanks to several posts on the site, I cleaned mine for the first time. One of blades is pitted on the front edge and also on the back side. On the second blade the metal coating is starting to peel around the top threads, but not onto the shaft where the rubber o rings go. Are these major problems that would require me to change both blades?