Originally Posted by epson
Check the SetIf you're still having problems you will need to purchase a new lock. Visit a local home improvement store and purchase a lock that closely matches the one that is currently installed it will be much easier to install.
So much for THAT idea.........
I've worked on many of these over the years
You can take the whole unit out of the side of the door and it will typically split in half by loosening a couple of screws on the face.
Be careful because things (like springs and levers) are going to want to pop out of position.
Flip the mechanisms back and forth and watch how they work and what holds what.
Look for loose screws, broken springs, etc
Clean and reassemble.
Some parts can be obtained at the antique stores or locksmiths.