It is possible to use a simple torque wrench extension bar, which fits onto the square drive of the torque wrench.
http://www.dmctools.com/Products/torque_conversion_charts.html
At the other end of the extension bar is a male square drive for the socket. This increases the leverage of the torque wrench by a ratio which is the total length of the wrench plus bar divided by the length of the torque wrench only. You multiply the torque reading by this ratio.
Note that NO increased torque is obtained by fitting an extension on the handle end of the torque wrench. The applied torque will still be the same as the torque wrench reading in this case.
Then there is a more expensive tool, a torque multiplier. These are often fitted to the output shafts of winches etc, and consist of a small gearbox which fits on the square drive of the torque wrench. On the other side is a male square drive for the socket.
http://www.tjtools.com.au/torquemultiplier.htm
They are geared in various multiplier ratios from 4:1 to as much as 40:1. On the gearbox casing is a reaction bar which is braced against something to keep it in place as the torque is applied.
They are expensive but you can hire them also.
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