I've had a combination Master Lock attached to my gym bag for several weeks now. Between vacation and then being bad for a week and not going to the gym, I had forgotten the combination. I was thinking maybe it was time to take a hacksaw to it and buy a new lock.

I did a little googling first. I found this site, which describes a way to narrow the number of possible combinations to 80. It gives you 10 possible numbers for the first value, 8 for the second, and 1 for the last. I figured it was worth a shot. I wrote down all 80 possible combinations, then started cherry picking ones that felt right.

It helped that one of the 8 values for the second number looked very familiar to me. I tried those 10 first. It was the 10th one.

Holy crap, I can't believe after just 10 tries I figured out the combination to this lock. Kind of worrying, but kind of cool too. If this hadn't worked, I was next going to try building a shim from a tin can.