| Screw Gears Screw Gears. Screw Gears are four gears with missing teeth, mounted onto screws. Screws A and C are righthanded, B and D are lefthanded. The goal is to screw the four screw gears into the frame, such that they line up. That is, the letters ABCD are straight, and each screw is all-the-way in. The challenge is in the missing teeth. Each gear has some teeth missing, and a blocking surface instead. Teeth of neighboring- Screw Gears. |