The claw would be an opposite piston. It would not be able to push anything, but can pull like a sticky piston. Redstone activates it. For each redstone signal strength it gets, the maximum amount of blocks it can pull back increases by 3. If there is a block in the way of the claw, it tries to pull it back. The claw extends 3 blocks. As long as it is powered it will be extended and when it is unpowered it will try to pull the block in front of it back. If it is immovable or it is connected to a number of blocks that is too big for it to pull, it will retract and not pull anything. It would be crafted with 3 iron, 1 Redstone, 4 cobblestone, and 1 gold. It would look like a sticky piston but the top is white/gray, and the green slime part is yellow. It could be used for large doors, sugar cane farms, flying machines, drop down walls and floors, sliding doors, triple piston extenders, rising doors and walls, large T flip flops, hidden entrances, retractable trees, cobblestone generators, decorations, and much more.
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