I've had this idea idea in my head for months. It started when I realized I had too many keys on my key ring. I wanted to only have one key. A universal key that didn't jingle around with other keys in my pocket. I bought a rekey kit from eBay to consolidate the Schlage SC1 locks and a new cylinder to change my sliding patio door from a Kwikset to a Schlage. I was inspired by the Leatherman Micra key mod to put the key in a multi-tool, but I wanted something other than the Micra. I had some other multi tools that I considered using, but when I saw the Squirt PS4 announced I knew it would be superior than anything else I had found. Here is a guide: I captioned the images for people who want to go through it quickly Please let me know if you want to see the images, but they have expired from tinypic. I will upload them again. I elected to get rid of the scissors because I felt they would be the least used tool. Aligning the scissors up to the key for a pattern was actually the most difficult part. I wanted to make sure the pattern was straight so I had to keep the scissors closed while I was trying to clamp it. An extra spring loaded clamp at the end helped keep it in position. I used a fiber reinforced cutting wheel with a Dremel to make all of my cuts. Removing all of the excess by cross cutting before grinding the pattern in to the key was a quick method. A FACE MASK AND GOGGLES ARE HIGHLY RECOMMENDED WHILE CUTTING THE KEY. THE KEY PARTICLES ARE VERY HARMFUL. You could probably use a drum sanding bit to get the nice rounded shape around the edge, but make sure to switch from a rough bit to a smooth one before your shaping is all the way finished. Once its cut do a test fit to see if you need to grind any more. I ran in to some trouble when trying to get the key to close. Some plastic was in the way. I wanted to keep the top and bottom stops on the key so it would fit in to the lock nicely. You could probably cut the stop on the top of the key so it doesn't protrude from the leatherman as much, but I left it for now. [Update 7/16/10 I cut off the stop which was sticking out, see updated pics below] I did loosen up the opposite end to get the black plastic to pivot away from the metal so I could grind it. Once the bottom stop fit in there was another point near the end of the key that hit the plastic. Put it all back together and you're done!