MEDIATOR® linear door opener, The front door is always locked - day and night. The house can be left through the front door at any time, despite the door being permanently locked. If visitors come late in the evening or early in the morning, the locked front door can be conveniently opened from the apartment. Different spacers are available to match the strike plate used to adjust the rebate clearance. An available sliding piece bridges grooves and unevenness in the profile.