The t post are high carbon steel. They are as hard as most drill bits. That is why you are having troubles. The cobalt bits will work a little better but not much. Are you using any oil or cutting fluid while you are drilling???? If the post are loose where you can use a drill press plus oil/coolant then you may be able to drill them.
Like One of the other guys ask. Why go to all of this trouble when a clip on isulator is 33 cents each?????
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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