I bought one of these hammer multitools some time ago, for next to nothing. There was a tool that’s a combination bottle opener, can opener, serrated blade, metric wrench, and flat driver. It was poorly designed and very weak due to the center cutout, and I broke it the first time I used it as a screwdriver.
I’ve found myself using the hammer part of the tool for closing paint cans. It’s a small hammer and really that’s about all it’s good for. I had a standard church key to open paint cans... and decided since I was already a tool down, they definitely needed to mate. So out came my welder and I made this! I even retained the bottle opener functionality.
Charles.