That is the 2+2=4 I have been working toward in my questions about wrapping the coupon around a cone mandrel. To that end, I had asked about milling a tight groove along the vertical of a cone and using it to give the initial grasp of the coupon edge. In fact, I have a swage block with the half-depth cones, but these particular ones are too big. If I need to, I can get the block sawed down the lengthwise middle and have the open swage block.mike
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