ok....my doors are sagging...most ppl replace the upper hinge but what appears to be worn on mine is in the picture below. at the top of that pin thing is like a rolling bushing, on mine they have worn into an eliptical shape and therefore are not as tight as they used to be and it appears to be causing the sagging. ok my question is, ive seen these pins before at auto zone and stuff but are they actually replaceable or do you have to replace the whole hinge? are they really hard to do because all of these bolt things i have seen around here have been opened before and returned and they tape them up. anybody have any experience with this?

lol..sorry the pic would help...

 

My roller thing is also messed up on my hinges. Would repairing the upper hing with the kit from thirdgen solutions and replacing the lower pin fix this problem?

 

The roller does nothing but hold the door open. The hinge bushings and the steel pins hold the door up and when the door sags that's usually the parts that need replaced. Some times the door itself is bending and letting the hinge move outward just a little and the door will sag. Usually from having someone get out of the car and pushing on the door to get up and out.