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Step 5 of 6

Step 5: Balance your character

Press a lump of Blu Tack under the bead and squash it into a flat sausage along the box, no more than 1cm deep, so it clears the floor. Keep it off the wire. Fix the straw on top of the bead with another small lump, and your character on the straw. Turn the handle. Does your character stay upright?

Left, the open box from one end, cut away: the paper clip crank goes through both walls with a bead on the bump, a short straw on the bead holds a paper boat above the rim, and turning the handle moves the boat up and down. Right, the box from the side with the bead at the bottom of its turn: a flat sausage of plasticine under the bead runs along the box and still clears the floor.