In article 1123873867.651439.117340
@z14g2000cwz.googlegroups.com, says...
just a regular guillotine die nick


If you can, you might want to think about a rotary shear.
Last time I purchased them rotary knife blades were
remarkably cheap, if you pick something that's intended for
common machinery. I believe 3" or 4" diameter blades made
from D2, ground with a special edge profile, were less than
$20 each.

Ned Simmons