Instructions

# Say your PIN is 8691. Choose a word of four letters which no one else can guess. For example we have taken the word DASH

# Slide the arrow next to the first letter of your code word (in this case 'D'). Put a cross above the 8 in row 1

# Slide the arrow to the second letter of your code word (A) and put a cross above the 6 in row 2

# Slide the arrow to the third letter of your code word (S) and put a cross above the 9 in row 3

# Slide the arrow to the fourth letter of your code word (H) and put a cross above the 1 in row 4

# To decode your PIN, all you have to do is move the slide so that the arrow corresponds in turn with the four letters of your code word and read off the numbers under each of the crosses