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chrisabraham OP t1_jdhx1rc wrote

As a scuba diver I'm really careful about the o ring because the back really could be compromised. That's why G-Shock watches make it so hard to replace the battery and all you need for a Core is a nickel. Keep the oring clean and make sure it's not nicked or dry. If needed, a little silicon oil but wipe all the excess off. Good luck!

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