I have a 74 Blazer with aftermarket locking hubs. The center is brass colored with either a "WW" or a "MM" on it. Do I have Warn hubs or something else? Anyone have an idea where I can find a service manual on the hubs? The Warn site doesn't show the "WW" on premium or standard hubs. My right front will not lock in after having sat for over six months. Any suggestions? Thanks.