Not sure if there is a standard method,but the method I use is to blue the shaft and slide the hub on,then twist the hub 5* and back 5*.Remove the hub and see where the bright spots are on the shaft.
Idealy you want a contact area of 2/3 starting at each end of the taper and extending to the center yielding a slight hour glass shape.The opposite of that is is a barrel shape and undesirable.
I quit using Dykem for checking tapers,the stuff I can get locally is a little too thick and it "drags" marring the contact pattern.I now use the common black marks-a-lot,I find it gets me closer to fit faster and it's cheap.
What are you fitting,prop shafts?
[This message has been edited by wierdscience (edited 06-09-2005).]
I just need one more tool,just one!