What does everyone use for jimpig the backs of their knives?
TBRA
I never jimp my blades. The folks I know who do use hack saws or fine files.
What's jimping?
Lowell:
A hacksaw? I guess that would be effective yet brutal.
Karl:
It what I have heard the grip cut into the back of the blade called.
Karl,
Jimping is all of the small notches you see cut into the spine of a blade where your thumb rests when it is extended. I personally have never seen hand jumping done well. Water jetted knives have sharp / crisp jumping. Personally I don't see any need for it and do not include it on my blades.
I've used a metal checkering file to score the lines in, then a 3-corner file with a safe side to cut the lines deeper. By alternating the safe side as needed, you can get them pretty sharp and even.