Today when I try to seperate the joystick from a frontplate of one of those HRAP, I found the screws are too tight to unscrew.

Afte some googling, I found out there is a tool called Manual Impact Driver

, which could delivers a strong, sudden rotational force and forward thrust when struck on the back with a hammer. Which usually use to unscrew tight screws.
So I went out and acquare one from a hardware store. After returning home, I successfully unscrewed the screws with the Manual Impact Driver, and once again proved that violence can solve the problem.
I can't believe I could mod so many HRAP in the past without this handy tool.

*Meow* I am as serious as a cat could possible be. *Meow*