Join Date: Sep 2005
Location: Essex, MD
Bikes: Ridley X-Fire (carbon, white)
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If it's a Shimano chain, then there is likely a replacement pin for it. If you try to reuse the pin you pushed out, the chain will be weaker at that point and may come apart under the right amount of stress over time.
Instead of a replacement pin you can purchase a master link that is specifically sized for your chain (i.e., Wipperman 8, 9, or 10 speed Connex link).