On Thu, 02 Aug 2007 08:36:06 -0400, Wes wrote:

Neat. Where do you get that single flute counter sink at?


http://www.maford.com/taf/catalog.ta...3EFE5346B1D6F9

The grooves could also be cut with a regular endmill with the mill
head rotated, but the c'sink is much more convenient. You want a small
flat at the bottom of the groove to allow some overbend when folding
the part to compensate for springback.
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Ned Simmons