That's pretty much my thought.... Are there folks who are capable of recalling EXACTLY what the instrument sounded like when the last set of new strings were installed, and then capable of aurally making an exact comparison of this remembered tone with the newly-installed strings and bridge pins?
I have no pretensions in this regard. Frankly, I have pretty poor hearing. I'm 65, have hearing loss from shooting in one ear, and tinnitus to boot. I'm no judge.
Just from the physics of the thing, it would seem that unless there were a substantial change in mass in the bridge pins, to the extent that it would contribute to a change in the entire vibrating mass of the top of the guitar, there could be no effect.
So, go from plastic to say...Brass. Sure. You might get a couple of percentage points more mass. But plastic to....Bone? I don't have a guitar top structure lying around, nor a precision scientific scale. But I would wager that the difference in total mass would be near-undetectable.
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