You will need
  • new larva
  • - screwdriver,
  • roulette.
Measure the thickness of the door.
Lock the door in open position and with a tape measure its thickness. If your door is insulated, it is necessary to measure the end taking into account the thickness of the insulation. Otherwise the larva of a new lock may be too short and will "utaplivajutsja" in the upholstery.
Pull the larva out of the door.
Remove the locking bolt from the striker edge of the door. Insert the key into the lock, turn and lock it in position "open" (if your door is on the inside, closes with a "chopper", is enough to turn the "turntable"). The Cam must match exactly with the profile and not to interfere with the larva. Press your fingers on the lock cylinder with the outer side of the door and carefully remove the core of the lock.
Produce a measurement of larvae.
Measure its width, length, and diameter. Also pay attention to information about the manufacturer of the castle. It should be indicated on the core.
Insert the larva ago, turn the key to the closed position, tighten the locking bolt and go to the store.
Inform the seller about the size of the castle and the producer firm. When choosing the right option you should pay attention to the color offer you the larvae. It is very desirable to match with the colour of your door. You also need to decide which castle you want to put the one that closes with a key from both sides, or one where on the inside of the door is "spinner".
Pull the larva out of the door again, as described in claim 2
Insert a new one instead. Lock the key in the "closed" position and tighten the mounting screw to the edge of the door. Your new lock is ready for operation.