Maybe these will be clearer.
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I found this article from an old mechanics Illustrated from a google search.
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I am currently designing a cross bow that shoots paint balls, golf balls and tennis balls, so googling crossbows I found a site that has a "stonebow" it is a crossbow but has two strings with a pocket in between the strings that a rock is suppose to go in but I want to shoot paint balls with the exp...

8) Very nice spud gun