Torque Wrenches - my answer...

[Alan Pritchard]

"In any Physics book you'll find that a force which is not exerted at right
angle to the torque arm, will not exhibit the maximum torque at the pivot.
You have to use trigonometry to figure the exact numbers" Ameer

I kinda agree with that. If an extension (say a scaffold pole) was fitted
over the end of the wrench, it will alter its angle in relation to the
wrench until the end of the tube touches the shaft of the wrench, and the
end of the wrench touches the inside of the tube. Although the end of the
clicker type wrench will still "click" at the same torque, the applied force
can vary. If you draw a line from where you hold the tube, to the axis of
the square drive, this distance will be your new lever length, and
perpendicular to that is where the correct amount of force needs to be
applied for the maths to work out, although, like stated before, the
mechanism in the wrench will not see any difference in torque.

A good example :
http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/RotationalDynamics/Definitio
nOfTorque.html

Shows actual force perpendicular to a lever arm when force is not applied
perpendicularly.