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My (broken) chain riveter has 4 pins to hold the chainChain riveter

I always used the 2 on the left side since there is the possibility to apply counter-pressure with the screw. What is the purpose of the right pins?

(Please correct me if I used the wrong word for the tool)

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    The screw to apply counterpressure has a hole so the left pins can be used to push the pin out too.
    – CuriousIndeed
    Mar 10 at 20:40

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According to a couple of videos I found online, the left - in your photo - "shelf" (or "cradle") is for pushing a pin out or pushing a new pin in. The right (closer to the screw) shelf is for loosening a tight link.

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    You're exactly right, is for "loosening" a pin - this situation can happen if one reconnects a chain and it is not moving freely, resulting in a "stiff link" which interferes with shifting and can make clonking noises every 4-8 pedal strokes. Personally I fix a stiff link by putting my thumbs on it and "bending" the chain sideways with hand pressure, which has generally been enough with a push-pull. Ideally a chain should be floppy.
    – Criggie ♦
    Mar 11 at 6:15
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    @Criggie Yeah that's how I've always tackled a stiff chain too; of course my chain tool doesn't have a fancy feature specifically for that. :D
    – DavidW
    Mar 11 at 16:12

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