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Matthew Fienup
Mar 2, 2007
3/8" Stud Bolt removed from Permanent Income Hypothesis, in the Fortress. These bolts can be quite strong in 4,000 psi rock; however, there is no way to know how well the bolt has been placed and how much expansion has been achieved. As a result, these bolts vary wildly in pull-out strength from one placement to the other. In soft sandstone, these bolts are scary.  

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