NC Wayne: It is just a ratio problem. You need to know the length of the original torque wrench. This is usually measured from the center of the square drive to the middle of the handle you pull on.
So Lets say that is 10 inches.
So using your adaptor the length would be 10+1.5= 11.5
You need to know what percentage the old lever/torque wrench is compared to the "new" length of the combined tool.
So divide 10 by 11.5 = 87%
So the original wrench is 87% as long as the combined wrench.
If you wanted a final torque of 350 foot lbs. you would set the wrench at 87% of that or 304.5 foot lbs.
The only caution is only use the extension/crows foot straight out the end. This makes it a straight level problem. If you go to angles it gets to be a very complicated math problem to figure the actual torque.
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