I must be doing something wrong...
I've installed a whole bunch of these, 1.0 and 1.1, and the hardest part is the breathing...
I did find that not using a washer is easier to lign up... I don't even test, I just slip into Mode 2, place on the mobo, screw, and power, and I'm done.
And I haven't had a single one go loose on me yet, and a few travel regularly for gaming meets...