How do you fix a broken left bumper on an Xbox 360 controller?

I have been playing Crackdown a lot and using my left bumper to reload a lot. However, after a lot of reloading, the left bumper is stuck and it is nearly impossible to press. Is there a way to fix the bumper, or do I have to shell out $50 for a new controller?|||You buy a new one sorry for the bad news, Micro center has them on sale for 29.99, these days fixing electronics is dead, they call all new electrical components dead weight once it brakes you buy a new one dissposable electronics|||Just try wiggling it or take it apart.