I'm having the same problem myself. If anybody has an answer, I'd sure like to hear it!
My 2001 Honda Accord got side-swiped while parked on the street. I had to replace all the doors on the passenger side with doors from a junk yard. They work fine, except I can't get the stinking lock mechanism out of the replacement door, to put the lock mechanism in from the old door.
Any advice would be greatly appreciated.