I have a hinge wear problem... The door has begun to crack where the latch is because it comes in so low on closing. The pin is worn out on the top hinge. Anyway... I bought upper and lower replacement hinges for the Driver side door. I have done a couple searches and not really come up with enough information to tackle the project. My main concern is on both hinges there appears to be a hidden bolt. Those of you who have changed your hinges, how did you get to that bolt? Or, is it frozen and are you able to "unscrew" the entire hinge once the door is off? Any help out there would be much appreciated. Thanks in advance