The same Wave Frank was using to jimmy the lock in the other post, and in the last issue he was about to use it again to remove some C4 explosives from a baby (!), until the BARRACUDA caught up with him.
Scroll down at this page
http://www.thepunisher.com/archives.html and you'll see a few comic panels...click on each one to make it bigger. I can't really make out what happened but it looks like he used the pliers in the guys' nostrils and twisted!