I'm trying to remove a schlage lever on an interior door (there is no lock, only a latch). I've removed
- the levers
- the latch
- the finish covers
- two screws that connect the two halves of the lever mechanism
Now I'm left with what's left in the picture above. There doesn't seem to be any more accessible screws or release pins. There is a collar nut in the center. I don't seem to be able to turn it (perhaps it needs a special tool).