Decoding a Master Dial Combination Lock Part 2: Determining the first number

This video shows how to figure out the first number of the combination. Part 1: https://www.youtube.com/watch?v=uurLUFlduU8 Part 2: https://www.youtube.com/watch?v=TdJLVDO9ipU Part 3: https://www.youtube.com/watch?v=Bmofil8p9gg Part 4: https://www.youtube.com/watch?v=kEINjfcI8Io Most of the tricks in these videos were developed by others. Samy Kamkar has a particularly good web page with more details at https://samy.pl/master/master.html