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DIY for the Weekend: Build Your Own Trebuchet!! – Lichtenberger Engineering Library
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How to Build an Awesome Trebuchet : 17 Steps (with Pictures) - Instructables
This Massive Homemade Trebuchet Can Launch Washing Machines - Nerdist
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How to Build an Awesome Trebuchet : 17 Steps (with Pictures) - Instructables
How to Build a Trebuchet (with Pictures) - wikiHow