"If you will look in the manual, you will see that this particular model iPhone mute switch requires a range of 10 to 16 foot-pounds of torque. I routinely switch the maximum allowable torquage."
"Well, how could you be sure you used 16 foot-pounds of torque?"
"Because I used a Craftsman model 1019 Laboratory Edition Signature Series torque wrench. The kind used by Caltech high energy physicists. And NASA engineers."
"Well, in that case, how can you be sure THAT's accurate?"
"Because a split second before the torque wrench was applied to the mute switch, it had been calibrated by top members of the state AND federal Department of Weights and Measures... to be dead on balls accurate!"