Do a web search, there are clubs and FAQ’s for this kind of stuff. I learned how to pick most Master locks. I pick up the “unclaimed” ones at the gym, and make them my own.

For many models, you can…

put tension on the shank to get the last number. It will stick more than the others. In fact, there should be tension at 6 points, of which 5 are equal in mod 5 or something (again look it up), the remaining one is the last digit.

The second digit remainder when divided by 4 will be 2 off the last number, and the 1st will be equal. (So if the last number is 28, the second one will be 2,6,10,14,18 etc and the first one will be 0,4,8,12,16 etc) That leaves you with 100 combinations to test. It shouldn’t take more than 20 minutes to go through them, especially as you only test 50 on average.

Again, look it up on the web. It’s out there.