I have read that the way to torque lock nuts is to read the torque
required to turn the nut when it is fully engaged on the bolt but not
seated. This is the torque required to overcome the friction of the
locking mechanism (nylon or bent tabs). Then add this value to the 
required torque for the application, and turn the nut to the total value.

John,

 

Egads, that was a 9 lb/in head snap.........  Now I must run down to Sears for a set of those indicator torque wrenches since I could never work out the running torque with my click wrenches.

 

My wife thanks you, too.  She said she will pop for the set as a present on our up-coming anniversary.  I think this is our Chrome anniversary (or was that bronze?).