[SCRIPT] Lever Issues

[daortir]

Hello there !
Simple script issue : I suck at using levers, so basically, how can I make a lever stuck in a position, then be movable again when an event occured, and call a function when it's used ?

As I said, I'm really terrible with scripting those lever/wheels/thinggies, I'd love to get some help so I understand once and for all how it works ; D.