Master Lock combination padlocks have been known to be vulnerable to an attack that reduces their 64,000 possible combinations down to 100. I've devised a new attack for cracking any Master combo lock that simplifies the process and reduces the amount of work down to only 8 combinations.

Use this calculator in conjunction with the instructions below to find the 8 possible combinations for your Master combo lock.

Watch the video for the full details, deconstruction, and a sneak peak at my robotic combo lock-cracking device. Written steps can be found below.