Thread a piece of brake cable through so it creates a loop, pull the ends apart with pliers to tighten it, pops right open
Not a good idea to do this with steel cable. It can gouge the pin in the link which can then cause an intermittent and infuriatingly-difficult-to-diagnose skip in the drivetrain. Use string or something similarly soft.
@Valente started
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Thread a piece of brake cable through so it creates a loop, pull the ends apart with pliers to tighten it, pops right open