Combination recovery for the majority of Master Locks consists of narrowing down the possible number of combinations to a reasonable number (usually 64) and the using streamlined methods for dialing and checking each combination. For other locks, about 340 two number combinations may need to be tried, but you may be able to speed up the process along the way. The same streamlined methods work. Even though safes have a single dial, the internal mechanism is different from the padlock and these methods will not recover the combination.
Some sites and videos find the numbers using mathematics. To calculate the 10 first numbers, we divide the third number by 4, using grade school techniques, so 8 with remainder 3 (8 R 3). The remainder, 3, is the leading number in the list. Then, we added 4 repetitively to that number get the other 9 numbers. To calculate the 10 second numbers, we added 2 to our third number, for a sum of 37, before performing our grade school division, which resulted in a remainder of 1, our leading number on the second numbers list. Then, we added 4 repetitively to get the other 9 numbers. Note that some sites use the term "modulo," which is really just a shorter way of saying "grade school division remainder."
Even 64 combinations may take 10 or more minutes to try. We've added a streamlined technique for dialing all combinations with the same first number. Also, we have a technique for checking whether the first and second numbers are correct (without dialing the third number.) So, for the Master locks, we use manipulation techniques to locate the last number. There are also some manipulation techniques that help locate the first and second numbers, but, for now, it is faster just to dial 64 combinations.
Locks from other manufacturers (unless
Master Lock Company manufactured the locks for marketing under a different
brand name.) Of course, keyholes are vulnerable to lock
picking. Lock picking is outside the scope of this site, simply because
there is so much information about lock picking already on the internet.
However, we have added a page specific to
picking combination
locks with keyholes. For other locks, we try as many as 340 two
number combinations that have even first and second numbers. Combinations
with the same first number are tried without redialing the first number
every time. We test for correct first and second numbers using the "binding
sticking places" test described later. When we find that we have the first
and second numbers correct, we locate the third number. |