I am using a 1/2" masonry bit in an old hammer-drill. At the slightest
catch, the bit slips, even to the point of coming out. It uses the old
screw thing to tighten.
I am thinking of grinding the bit up and down the bare spot. Any other
Problem solved. I asked a friend and he told me to just grind a little bit
off three sides of the shank of the masonry bit. I did; it ground like
butter. And when the bit grabbed the material, it threw me against the
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