W124 - swap door locks

[ChipJ]

Can someone give me really careful instructions on how to swap the driver's side door lock with the passenger side? The driver's side one is toast - it comes right out when you pull the key out of it, and it does not function anymore to unlock the door. About a third of the locking tabs are out of it - they had worn out and the locksmith said to just remove them to make the key work OK. The passenger side one works fine still. I'm close to my wits end - it's either this or install a keyless entry! Car is a 1994 E320 station wagon.