Finally we tried using a robot hand toy that we took apart, gutted, and reassembled. This robot hand required quite a bit of pull strength to get the fingers to bend enough. So we discovered that a light, flexible, and springy material was necessary so that the fingers will bend accordingly and then return back to the original form of being straight. The material should be light so that there isn't a whole lot of strength needed to tighten the strings and bend the robotic fingers.
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|Detail Data Of Kids Plastic Robot Hand Tool Toy 36CM :|