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Unread 10-22-2013, 12:57 PM   #3
grumpyvette
retired mech engineer
 
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Join Date: Sep 2007
Location: florida
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that video might have been staged but Ive actually seen my not too brilliant friend launch a 1/2" DIAM. steel ball bearing from a sling shot against a concrete wall and have bounce back leave him crumpled with a noticeable black & blue bruise on his chest THE SIZE OF A GOLF BALL

http://www.youtube.com/watch?v=i0bl4O9Hj0w
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