I was curious if any of you knew about an old master lock trick; where you could discern the combination by pulling on the padlock and turning the dial until it stopped to the right. This, when the dial stopped, would give you the first number within about 5 digits. You would reset the lock and put in the number and use the same process to find the other 2 numbers. I know this is a dated trick and that master has fixed the flaw in their locks that allowed it to happen, but it was still a fun to use as a magic trick while it lasted.
Has anyone else heard of this trick? If so do you remember about how many years ago they fixed it?