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We want to cover the sealing surface of the watch without getting any adhesive into the (3x) spring holes.
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Tiny springs go in these holes and make an electrical connection between the watch case and bezel.
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If you want to improve the waterproofing of the finished product, you can line the entire perimeter of the case with Sugru, but it could reduce the Bluetooth range. I haven't tested this myself but will the next time I repair another of these watches.
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Lay out small strips of the rolled Sugru, until you've covered the perimeter of the bezel. Give the Sugru a light smush into the bezel to keep it in place.
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I put a thicker coat of Sugru than necessary on this watch, but we will address that later. You should roll the Sugru out a little thinner than I did.
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