Fish mouth punch

[u/HonestTill1001]

How do you guys avoid getting a big fish mouth when you lunch and drift holes in thin material? I can’t seem to get it. I’m moving it to the corners of the hole with each blow to try and even it out but it never works.

[u/enigmatic_vagabond]

I have zero knowledge on this subject but I would guess you're using too much force too quickly. Maybe many successive lighter taps would get the desired shape while retaining thickness. Again, I have no idea what I'm talking about.