After reading another post about doors getting stuck, I thought maybe you gurus could help me out with my seemingly minor problem. I have a '70 plain jane kinda car that has problems unlocking. It seems that when it is locked, you have to try several times before it will 'catch' and unlock, otherwise, the locking knob just goes up and down without doing anything. It does this whether you are trying from the outside with the key, or from the inside with the knob. After a couple of tries (usually three which has become kinda a joke among friends) you can feel it catch and work fine. I assume something is worn, but have no idea what to look for. Thanks for the help, you guys are great!!