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

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SUMMARY

The black piece in the mechanism is made of plastic primarily for weight reduction and to provide flexibility in the axle support. This design choice enhances the overall functionality of the mechanism, which is likely involved in shooting baseballs. The plastic component serves a critical role in ensuring smooth operation when the lever is pulled, allowing for efficient movement without the added weight of metal.

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20GT
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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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