As the Russian proverb says, “water will find a hole”. And one that cannot be detected “by eye”. Help out in this case a bucket of water. Drop it into a “soggy” boot and squeeze, tightening the top shaft: emerging air bubbles from the holes will be given where it “hides”.
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Found another use for plastic bottles of carbonated drinks. Should trim it as shown in the figure, and turns out to be convenient scoop for bulk products - flour, sugar or cereals.
