This indicates there is no glass behind the frame.
How to install new door key lock.
Place your head near the frame and tap it with the end of a screwdriver until you hear the sound change.
Insert the exterior part of the lock into the door by feeding the long metal piece through the opening in the center of the bolt.
Insert the new lock assembly into the door with the slanted side of the lock facing the direction that the door swings closed.
Close the door to ensure the sloped side is facing the proper.
Once the new pins are in reverse the steps to reassemble the lock.
Mark each screw hole.
Push the spindle through the latch and push the keyhole side onto the spindles.
Dump out the old pins insert the new key and use tweezers or small needle nose pliers to match the new colored pins to the color code on the special instruction sheet.
Insert the pins and reassemble the lock.
Hold the new lock up to the door to determine where the lock and screw holes should be drilled.
6 test the deadbolt to make.