B Why is the Black Piece on this Mechanism Made of Plastic?

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The discussion centers on the use of a plastic component in a mechanism, questioning why it isn't made of metal despite being bolted down. Participants speculate that the plastic may serve as an axle support, potentially reducing wear or friction. There is curiosity about the mechanism's function, with suggestions that it might shoot baseballs. The primary role of the plastic part remains unclear, prompting further inquiry into its specific function within the mechanism. Understanding the design choice could provide insights into the overall operation and efficiency of the device.
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why is the black piece plastic instead of just extending the metal? its bolted down. is it just for the axel support? Can you think of a reason they did this?
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thanks for your opinions
 
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I can't imagine how this mechanism works (shoots baseballs?). What happens when you pull the lever?

In other words, what is the primary thing that the plastic component in question does exactly?
 

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