propeller bolts

Not sure how that is going to give you a "More Accurate Torque"?

You will torque the Nuts to what you believe to be the exact spec number and then turn them one way or the other to get the hole to line up with the castle.  There goes the Spec!

The amount of drag introduced by the Lock-nut is less than the tolerance of your Torque wrench.

An M8 Lock Nut is typical ~5 in∙lbs on the first use and <1 in∙lb if reused.  Is your Torque Wrench that accurate?

In any event, the Propeller manufacturer has already has taken the Prevailing Torque of the Lock Nut into account when specifying the proper Torque needed. (And then rounded it to the nearest 5 in∙lbs.)

The Standard Torque for an M8 Bolt varies from 220 to 265 in∙lbs depending on who you ask.

5 in∙lbs one way or the other is not significant.

You are making this way too complicated.

You are right Bill. I was thinking the drag on the thru bolt and nyloc nut was higher than that. Tried it today and the total drag on the used bolts and nuts is less than 5 inch pounds. I'm happy now.

The drag from the Bolt is more significant than from the nut.

When Tightening, you will want to put the wrench on the NUT and counter-torque the BOLT if physically possible.