mag00,

Your example of a cross lug wrench with an extension on the forward axis arm so it can reach further into a recess and then use the 2 remaining levers to apply force in a rotational manner around the axis of the bolt while reading a longitudinal torque indicator on the shaft of the rotational force generator, appears to be the same principle as placing an extension on a torque wrench where the socket normally resides and then attaching the socket to the extension. IOW, the extension is on the rotational axis and at a 90 degree angle to the wrench handle (lever). Is that correct? If so, you've certainly led everyone here on a wild goose chase by not clearly stating your needs - or - we have gotten so wrapped around the axle that we missed your point entirely.

Read this and you'll understand a bit more about torque:

http://www.ship.edu/~sagoul/Torque_rotation.htm

If all you're doing is extending the right angle socket by use of an extension, then the extension has virtually no effect, so long as you provide reasonable alignment support at the 90 degree angle at the end of the torque wrench. In reality, there probably is a slight difference because of your inability to exactly align and support the mechanism, but if you can keep it relatively aligned, you'll get close enough for horseshoes and hand grenades.

I'm sorry I don't have a formula, but does that help?

Frank