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the quikcenter tool works multiple ways. first, purchase the version with the correct diameter and thread pitch for the bolt/stud you are drilling out.
if there is a portion of stud protruding from the surface, thread the quikcenter onto the stud. now it will guide your 1/8" pilot drill bit directly into the broken stud.
if the stud is broken off BELOW the surface, you can twist the insert until it goes into the fastener hole. now you can guide your pilot bit.
finally, if the stud is flush with the surface, they make a collar that you glue to the surrounding surface. the centering tool will fit into the collar and allow guided piloting.
the tool is great. my only complaint is that they're made of aluminum and are a bit soft. i had to do ten bolts & my quikcenter is pretty much toast. the good news is that it was eight whole bucks. it was a life saver.
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Threaded Mode
