Awl --
Have you noticed that some roll taps seem perfectly circular, almost like a screw, while others almost resemble cut taps, but with much smaller gaps -- but with a bit of a "cut edge". Just got some Nachi 1/4-20s, and after I drilled the #1 tap hole, I looked at the tap and groaned, Ferchrissakes, this is a CUT tap.... but it's not, apparently. Let's hope not, cuz it's hard to turn a #1 hole into a #7 hole..... :( Kinda weird... I'm wondering if some of these taps aren't a kind of hybrid or sumpn....
Haven't used the nachi yet, as it's nappy-poo time....