Finding the third number of a combination Master Lock
by Randy Gluvna (gluvna@home.com)

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Note: This method only works with Master Locks made AFTER 1990.
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First, while holding up the shackle, spin the dial around many times.  The
dial will stop in several places where it will wiggle back in forth between
two numbers.  Note the places where this happens between two numbers that
aren't integers.  Three of these places will end with the same digit.  The
one that ends with a different digit is your third number!

