To reset a Master Lock, first open it with the current or factory code (often 0000) and insert the provided reset tool or align the shackle/lever in a specific way (usually by rotating 90° and pressing down) to engage the reset mode; then, set your new combination on the dials and return the tool/lever to its original position, finally testing the new code before locking.
Resetting your Combination Lock
Step-by-Step Instructions
What To Do If You Forget Your Safe Combination
The Master 5401 comes factory-set to 0000. To change the code, input your 0000 and open the unit up. To change the combination, push the Reset button across and up.
The total number of combinations for a 3-digit lock can be calculated by multiplying the number of options for each wheel. Since each wheel has 10 digits (0-9), the total number of combinations is given by 10 × 10 × 10 = 1,000. Therefore, a 3-digit lock has a total of 1,000 possible combinations.
If you've forgotten your combination, you'll need to either decode the current one by feel/sound (often by finding binding wheels and listening for clicks) or, if you can open it first (e.g., with the factory code), use the reset button/slot to set a new one, but you generally cannot reset a locked combination without knowing the current code, though some models allow opening with a master code or specific manufacturer help if you have proof of ownership.
The two biggest errors that people make when attempting to pick involve the use of too much force. Too much torsion pressure with the wrench will bind the pins too hard and make lifting the stacks difficult. Lifting the pins too high will raise the bottom pin up into the shear line and not allow the plug to rotate.
The easiest way to pick a lock is to use the fast and dirty method: scrubbing.
Enter the combination and pull the shackle to open. If this is a factory-new lock, the combination is 0-0-0-0. Turn Shackle 90° to position 1. Push shackle in to lock until it clicks.
Pick the Lock: Insert the straightened pin above the tension wrench and feel for the pins inside the lock. Push each pin up until you hear a click. Turn the Lock: Once all pins are set, turn the tension wrench to unlock the door.
Resetting a 3-Dial Lock
Solution: Double check that you have entered in the correct code AND that the code is lined up directly in the middle of the correct line. This is the line on the upper portion of the lock's face marked by black dashes, not the seam in the center of the face.
The most common methods a locksmith will use to open a door include: