Help - Software to Reroute/Shortcut keys to other keys.

So basically, my down arrow key popped off and I don't have time to go the Apple store for the next couple of weeks. I'm looking for some application that will let me set a key (or multitude of keys) to replace down.

I tried looking online, but I could only find applications that let you launch applications or whatnot with shortcuts, but not just replace another key.

Thanks.

Update: Well after looking even more, I found that Keyboard Maestro does what I want.

 

Yea, I checked that, but it doesn't do what I'm looking for it to do (it only lets you set keyboard shortcuts for menu items).