I had to make one of these in a science class in middle school. All I ended up using was a rat trap with a spoon epoxyed to the arm of the trap. To control the arc of the throw I had thick twine tied to the swinging arm of the trap, was very easy to adust, longer string made for straighter throw but less distance, shorter string made for a nice arc that went quite far. Make sure it is stablized well though as the force of the spoon swinging makes the whole thing flip over and a nice mess if you are using eggs. Hope this helps any.
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