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→cardboard model
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Spring is for moving of outside cover up and down. If be turned right, then outside cover goes up. And if be turned left, it goes down because of elasticity of spring. | Spring is for moving of outside cover up and down. If be turned right, then outside cover goes up. And if be turned left, it goes down because of elasticity of spring. | ||
== | == Test model from carton and transparent plastic film == | ||
<gallery> | <gallery> | ||
File:Hardboard-han1.JPG| | File:Hardboard-han1.JPG| | ||