Handcuffs - Stories of Tie Up Games
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The double lock (and the handcuffs, themselves) can be picked with a piece of spring steel, 1/8th to 3/16ths of an inch wide; 3-4 inches long, (available in foot long lengths from any locksmith). Use wire cutters to clip the spring steel to the shorter length. It takes a little practice, but with practice, you can get good at it.