Re: Cheap masterlock
The rest is systematic dialing. Start by turning the dial a couple times to the right, stopping on 0. Turn left, pass 0 once, and stop on 3. Turn right to X and pull up on the shackle. Didn't open? Go back to the left, pass 3 and stop at 6. Go back to the right, stopping at X and try the shackle again. Continue this procedure, adding 3 to the second number, until you have gone all the way around the dial (there's no sense in using a second number that is less than 5 numbers less than your first number,because the second wheel will just move the first number off, due to the intererence of the drive "pins").
By doing this, you're systematically dialing 0 - 3 - X; 0 - 6 - X; 0 - 9 - X, etc. until you exhaust everything that can be dialed using 0 as the first number.
This is when you advance to 47 - 0 - X; 47 - 3 - X; etc.
This looks messy on paper, and, as I said, involves a learning curve. But with practice, your dialing becomes more efficient, and you can "whip through" dozens of combinations per minute. I average 5 to ten minutes per lock with this mehthod; and have never failed to open a lock, unless it was defective or malfunctioning. (I even made a couple thousand bucks doing this for a fitness center owner, decoding his locker locks last summer!).
Open and prosper!