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Cut out the washer
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In this guide we're using an old yoghurt put to create the washer, because the plastic is thin, strong, flexible, and waterproof. But any similar plastic items can be used.
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Place the bottle cap onto the yoghurt put lid and draw a line around it with the marker.
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Carefully punch a hole into the middle of the circle with the scissors.
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Cut out the circle along the line.
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