Bathroom Handles
On the handle fitted to the inside of the door there is a button which when turned, operates the deadbolt on the bathroom mortice lock. On the handle fitted to the outside of the door there is an emergency release slot, usually operated by a coin or screwdriver, which can be used to unlock the door in an emergency. The turn button and the emergency release are connected by use of a smaller spindle, which passes through the bathroom lock. The images below show a bathroom handle with the turn button visible and a pair of bathroom handles with the turn and release connected to the smaller spindle.