Cal, this important issue will have to be decided the way all important issues are resolved in the world. I have the coin. Heads I win, tails you lose.
I admit I'm a bad person to ask about tennis elbow because I've never had it, but I notice de natha with a dampener, except the slightly reduced sound one gets with a dampener installed. I play with a dampener, btw, but not because it does anything for my elbow. The placebo effect probably has value, however.