Another good one is the 9v to AAA adapter.
9v batteries are just six AAA batteries in series. They're smaller diameter so you can print a little sleeve to fatten them up.
They're also slightly shorter so you can cram a little aluminum foil to meet the contacts.
If you have a lot of 9v leftover from work like I do, and it's a great tool.
I think the point of concern is that it prolonged the entire procedure. His heart was simultaneously being chemically stopped and electrically jump-started.
They should just push a ton of anti-Trump graphics.