The L9175 utilizes a special anchor inside the lock case. This anchor has holes that are tapped and threaded to receive the mounting screws that secure the spacer and mounting plate for the trim. Click here for the service manual image of the lock case and anchor with the screw holes highlighted.
If the L9175 has escutcheon trim, the same method is used for securing the spacer and mounting plate, however the escutcheon plate itself is surface mounted to the door.
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