Key handle grip thingy for light-up keys
This is just a simple handle grip thingy for a broken key. It used to have one of these silly light up handle things (http://i.ebayimg.com/images/g/euoAAOSw~oFXGEYA/s-l300.jpg), which is why it's shaped so funny - to make room for the watch battery.
It's a bulky solution and not very pretty, but our front door lock is pretty stiff so the extra leverage was an unintended boon. I used Gorilla Glue to make it stay together as the "pegs" aren't quite snug.
Edit it however you see fit.