Man it seems like only yesterday when I got mine which were the first peice to my Fett costume,.......and to think it's been nearly 2 years,and I'm almost done.
Dangerous? That is the point (pun intended). :evil Heck the whole suit is dangerous. I wouldn't recommend trying to get through airport security with them on though.
Oh, to answer you question, they simply screw on and off with a Phillips screwdriver.