I'm guessing this is a question more for the "hobbyists", as you pro's probably use jigs for measuring. I've used a "True Measure" from Golfsmith for many years. I've just noticed that if I measure assembled club length using a 48" ruler running down the back of the shaft, with the club in the playing position, I seem to get different results. At least 1/4" longer. I've noticed that if I sole the club properly in the True Measure, touching the middle of the sole on the flange, that it doesn't appear that the scorelines are parallel to the flange. To accomplish that parallel, I have to flatten the flange so the club's sole touches the flange much more towards the heel. And oddly enough, it seems to come out closer to the "ruler down the back" measurement method.
Have any of you used the True Measure? Have you noticed any discrepancies? I just find the True Measure is so convenient versus holding a ruler down the back of the club. If I just need to build a little fudge factor into the TM, I'm OK with that. I just want to know that I'm doing what I should be. Thanks for any help. -Andy