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#3
03-22-2013, 05:07 AM
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You not only need something to make sure the drill goes in 90 degrees to the block surface but also that the tapping process goes in 90 degrees as well. The drill is going to want to follow the hole which is already in there now and a tap can go in crooked especially when tapping by hand.
Last edited by hkalin; 03-22-2013 at 06:11 AM. 
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