Have a combination lock w/o the combination?
To get the odds, 39 digits on the dial x 3 numbers to the combination is 39x39x39, or 59,319 possibilities, but since the last number is unimportant, 39x39 leaves 1521 actual possibilities. And since they aren't that exact, every other number is good enough, reducing the odds by 50%, or 761 possibilities. Then, if you are lucky enough to have the first number to be 20 or less, take off another 50%, which comes out to 380 or so, which is doable.
Here is a way to figure it out; Turn right to zero. Use zero as the next number, turning to the left (you know how that works), then back to the right every two numbers trying the shackle. If you are lucky, it will open by the time you have gone around to zero again. You won't be, so try zero and 2 for the first two, using the same shackle-pulling technique. Then 0-4, ect, all the way around. By the time you have gone through 0-39, it is time to try 2-0- (shackle jerks), etc. Then 4-0- (shackle jerks), etc.
If you get tired of it, write on the back of the lock what numbers you ended with so you can take it up again where you left off. If you get real coordinated, the third number with the shackle jerking won't take much time at all, and you can do it while watching a ballgame or whatever.
I did try youtube (in vain) for a shortcut. So the above got my locks open after having them sit around for years. Beats being bored -but just barely.