I did some vibration testing for MRI units several years ago. Vibrations of unbelievable small amounts would drive these units crazy. I took 2 UL All Stars 1 1 piece and 1 2 piece. I put the probe on the handle. We actually took a feather and drew it across the rod tips. The amount of difference was nill. I am sure there are some rods that would not test that way. At that time All stars were excellent rods. I have over 20 of the old rods. What does all that prove? To me it means it doesn't make any diff.
IMHO.