How to attach a potentiometer to a servo motor shaft

wvmarle:
The normal way of measuring weight (what is often called "mass" though they're not the same thing) with a scale is by measuring force: the force at which the earth's gravity pulls at the object.

So attaching a spring scale to your handle and pulling it is basically the same thing.

Ok. So i did measure pound force (lbf). I need to convert that to pound to pound torque (lbf.ft). And then adjust for the length of the lever from the pivot point.