I accidentally bought un-punched cartos online. Instead of returning them, I decided to grab a carto punch tool from my local B&M. I got a hole punched without any trouble...but now there's a dent around the hole. Will that affect the way the carto performs?
Also, is there any way to punch a carto yourself without denting it?

Also, is there any way to punch a carto yourself without denting it?
