Just to advise that a "torque nut" can be purchased from
www.etrailer.com Think they charge 5.99. However... If you know someone with a small welder, simply get a small band of steel, drill a hole in one end and get them to weld the appropriate sized nut on it (and they get a beer instead).
For more details, surf:
http://www.etrailer.com/p-1332.html
.