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Those are similar to what i use. Mine are flat bottomed 2 fluted with a pilot, 5/32 dia.. I made them. They work really well and make drilling the tail hole very easy especially on small dia. needles and such. You can even use a hand drill because they wont walk as they follow the thru hole. I do use a drill press type machine though, it is easier but in a pinch a hand drill will work. Worth the investment.
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