www.wikihow.com/Crack-a-%22Master-Lock%22-Combination-Lock
Of these options, only the last two will leave you with a usable lock without emptying your wallet. Unfortunately, there are 64,000 possible combinations on a standard 40-number Master Lock. With this method, however, you can quickly narrow that down to 80 combinations, a workable number to try if you've got the time and the inclination to give it a shot.
This method only works with Master Lock combination locks, and may not work with all of them. It is rumored that Master Lock changed the combination algorithm on some of the newer locks, in particular those with serial numbers starting with the number 800. Some people, however, have reportedly had success cracking these with this method, too, so it may be worth a try.
discussion page for this article to check which serial numbers others have had success with. It is a good idea to turn it at least three rotations first, just to make sure it's clear. The shackle is the u-shaped part of the lock that goes around whatever you're locking.
lock down if the shackle is locked onto something solid. If you can't turn the dial at all, release the shackle and turn the dial clockwise just a number or two and then try it again. Sometimes it will stick right on the numbers, but sometimes it will be between the numbers. Turn the dial clockwise about one number from the sticking point in order to allow you to "escape" that sticking point. You should find a total of twelve sticking points in one complete turn of the dial. You should eliminate 7 of the 12 numbers with this step. Four of the remaining five numbers will share the same number in the "ones" place, so for example, if the numbers left on the list are 4, 14, 24, 27, and 34, the number 27 is the only one which does not have a four in the "ones" place.
Divide the third number of the combination (27 in this case) by four and write down the remainder. In this case 27/4 = 6 remainder 3 Remember we are only concerned with the remainder, which will always be 0, 1, 2, or 3 Write down the magic number (3 in this example). Now add 4 to that and continue adding 4 to each resulting sum until you have gone completely around the dial once. Thus, for the example above the numbers would be 3, 7, 11, 15, 19, 23, 27, 31, 35, and 39. One of these numbers is the first number of the combination.
add 2 to it, otherwise subtract 2 Since our example magic number is 3, we subtract 2 and get 1 Write down the answer and add 4 to it. Now add 4 to each resulting sum until you have gone completely around the dial once. Thus, in the example, the numbers would be 1, 5, 9, 13, 17, 21, 25, 29, 33, and 37. One of these numbers is the second number in the combination.
You've just narrowed down 64,000 combinations to only 80. Now try each combination until you find the correct one. If you're lucky, you may need to try only a few but then again, you may need to try all 100.
edit Tips * After cracking just one lock, the system becomes much easier to understand, so hang in there. Once you've figured out the third number, you can save time by using a special computer application to determine all the possible combinations. Otherwise, cutting off the lock and buying a new one makes more sense. After you align the tumblers, and determine the unlock code, you can seal the hole with a two-part epoxy.
edit Warnings * Do not use this technique to crack someone else's lock without permission of the owner. If you do that, you are breaking the law and could be prosecuted accordingly.
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