Crack a Master Lock Mathematically, Without a Shim
Apparently it is possible to reduce 64,000 possible Master Lock padlock combinations down to just 100. The entire process is clearly illustrated in the below how-to from Mark Edward Campos. For an enlarged version, click here.
Looking for something a little more interactive? We have loads of lock-picking tutorial videos. Here's one that demonstrates the same method (math as opposed to shim) outlined in the above illustration.