I'm replacing my door knob (no lock) with a lockable one (privacy set). I've taken out all visible screws but the knobs/door handles won't come off. I think it is a Lane(?) brand although I'm not certain.
I've tried moving both knobs to loosen the insides, also with a bit of baby oil, hoping it would help the knobs come off.
I tried to peek inside the tiny gap between the door and metal plate but can't find any pin or hole.


