Just before starting to reinstall a wheel and attach the knockoff I carefully anneal the brass end of my original Thor 04-310BHP hammer so that when measured with a Shore durometer (using the ASTM D2240 type D scale) I get a reading of 60, thus establishing a pre-tightening baseline.
I then have at the knockoff with the Thor, carefully measuring the hardness of the brass face with the aforementioned instrument. When the durometer reading increases to 74-76 measured at the center of the brass face I stop whacking.
It is important that the initial measurement be performed within 15 minutes of the annealing so that thermal expansion/contraction of the brass does not give a false reading, and naturally this procedure must be repeated for each wheel. I have been using this method for almost 20 years and I have yet to be passed by one of my own wheels while driving. This works on both the near and off side knockons.
BTW I imagine that ambient temperature may have some affect upon the readings I get and the relative force being applied but I have not yet factored it into my calculations.
And just how long does a wheel change take using this method .......cant exactly see you winning le mans in the pit challenge with this .
You must have way way way way more time on your hands than some of us .