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Cardboard sheet or hard Paper - 11 cm square
Mark at 0, 2, 11, 20 and 29 cm. Start the marks from the small end of the tube.
Fold at the remaining marks (2, 11,20 cm)
Fold the edges towards the centre line as shown.
Turn the paper around and fold again in half.
Fold along the length as shown.
Insert the right flap in the left flap as shown, so that it forms like a triangle.
Insert the 9 x 5 cm paper sheet into the triangle as shown.
Cut the paper through the marks.
Mark at 1 cm and 6 cm in all side