I have an old house ~ 28 years and it has Dexter Bath room lock. I want to change it, but I can't take that thing away from my bath room door. I was able to loosen front and back cover plates, but I don't see any other screws to un-assemble the lock. Can any one help me?

Thanks in advance.

Look for set screws between the knob and the flange or little holes in which you insert a small wire to release spring catch. Look both sides.

What is the hole in the knob in the center for?

What is the hole in the knob in the center for?

That"s for unlocking the door from the outside. Older locks had set screws or look for a small detent where the knob enters the escutcheon plate and push it in to release the knob.