Stuart

I've got this air impact wrench which didn't come with instructions nor can I find any online. Is the big red F dot or the little red F dot used to select the torque function? The blue nob, labeled 1-4, is used to select torque strength I'm guessing? I have tried playing around with some different settings on a test nut, but I keep getting a nut that is done up tight! no matter what setting I'm on...