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Well, I don't have what I need to try it, but I think if you bend the paper a little into a mobius shape, you might be able to slide a coin through it. Anyone able to test this?

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I think you can fold it in half then open out a little the diameter orf the semi circle so it seems to stretch/gape at the 15mm part.

like the straight part of D would stretch

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I think you can fold it in half then open out a little the diameter orf the semi circle so it seems to stretch/gape at the 15mm part.

like the straight part of D would stretch

Fold the paper in half. pull the points where hole which you convientiently fold perfectly half along with the paper apart and slide the coin through on its side.

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the hole has a circumference of 9.4 cm

fold the paper in half and you have a semi-circle with a circumference of 4.7 cm

if you bend the paper so that the circumference is in a straight line, than the coin will slip through with 0.7 cm to spare

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