Lots of cheap handcuffs on the market because - the people buying them really don't care. Stiff lock springs ensure they won't pop open and take a little more effort to pick open. Wouldn't want to be the manufacturer and have a bunch of returns because the cuffs wouldn't stay locked. If built with light spring action they wouldn't hold up reall well in the real world. I think your problem is banging them on the wrist to place them on a suspect. Bang anything made of steel on a human wrists and you can do damage. Use a little less force.
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