Lately I've been seeing some Hot Wheels keychains people have been making by drilling holes into either the body or the chassis but I "made" my own by just using Carbonator and a carabiner. It may not look as professional but I still think it's cool! I'm probably not the first to do this and there may be some other Hot Wheels this may work on but if you look at the pictures you can see how perfect it worked out. And also for the Carbonator, it's absolutely perfect as a keychain because it can function as a bottle opener and a soda can opener, so it may actually be useful to carry around. Be sure to check out my other post on Carbonator!