I tried a few regedit tools and keyboard editing programs, they mostly say that the alt key is not configurable. My spacebar is broken and making my alt key the spacebar seems like the easiest and cheapest solution. Does anyone know how to do this?
AutoHotkey will do what you're looking to accomplish, assuming you run Windows, which given the mention of
Then double-click the file. While the script is running, your left alt key will produce a space character, and you'll have a 'H' icon in your system tray by which you can exit the script, edit it, and otherwise control how it behaves.