I thought I would share a little tip I have for doing countersink holes. I assume most would drill the shank size hole and then use a bigger drill bit for the countersink. Normal drill bits never do a round hole and always end up with facets and the CS bolts never sit snug. I found that sharpening a reamer which has 4 flutes gave me a perfect round taper and even though I only had Morse Taper reamers, they still fit in my hand drill, well a No2MT anyway
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