| 1. To open a door. |
| 2. For the adjustment control to mark initial position of a washer of a latch, having led round its felt-tip pen. |
| 3. To weaken a nut of fastening of a latch. |
| 4. To shift a latch it is a little inside if the door knocks at movement, or forward if the lock is not completely closed. |
| 5. To tighten a nut. |
| 6. To check up density of closing of a door and reliability of closing of the lock. |
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