I'm trying to replace our dead bolt because it's keyed on both sides and for safety reasons, we want to put in one that locks on the interior side without a key. I have taken the screws out, but the lock won't pull apart. We have tried everything: pulling with the dead bolt locked and unlocked, turning the lock counter clockwise, nothing works. We even tried some WD40 in the crack between the lock and the door. Nothing. Any suggestions?