I recently bought a CDI 4-40 in.lb. torque screwdriver, the torque can be adjusted with a allen wrench through the butt end of the driver. A torque tester is recommended for setting the desired torque. Of course, I may use this tool in a way that I will often change the torque breakaway. A torque tester is an expensive piece of calibration equipment (~$1000 or more). Wondering if anyone has ever used a calibrated torque wrench to set the breakaway. The range or variance is 3-4 in lbs on the driver. Any thoughts?