hey,
we just bought the gravis destroyer and we cant find out a way to calibrate it.
can someone help us???please!!!
Did you get a spec. sheet with that joystick?
I’m afraid I have no direct experience with that model.
Open it up, carefully. You might find a trimpot or something similar inside. But I suspect that like many other cheap joysticks, there isn’t any calibration mechanism.
Heh. I thought this was a crackpot freshman post. I envisioned a laser weapon designed to destroy the gravises on all the other robots on the field. 
If anyone else had the problem we fixed it by
Doing this:
if(!p3_sw_trig) {
p3_y = 127;
}
So you mean that the joystick will be ignored unless the trigger is held? I guess that might work.
I noticed that the “new” “white” joysticks (sorry, I don’t remember the make or model of the joysticks we have received the last two years) tend to go beyond centered if you just let them go. So if you let the trigger go when you let go of the joystick (kind of hard not to!), the problem will kind of take care of itself. Nice solution!