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Identify the defect
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Here we can clearly see the defect: the strap hole is worn-out, so the strap is not fixed anymore and can pull through the sole.
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From the bottom side, we can see that the foam hole has become too large to keep the strap "stopper" in place.
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Preparation: We're going to create a plastic washer to keep the strap in place, and for this it's useful to have a guide to trace around. We're using a bottle lid, but a coin or anything larger than the hole will work too.
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