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But, the bridge stops the string. The string vibrates along its length, which is the distance from nut to bridge, what is fixed beyond the nut and bridge has no effect on the motion of the string. The material of the bridge pin can not affect the motion of the string.
So how can it be that the bridge pin affects a change in sound? Well if you analyze the guitar as a source-filter model (the source is the string, which is filtered and amplified by the body) and you have ruled out the source as the reason for the change in timbre, you need to look at the filter.
Bridge pins effect the change in sound because the alter the characteristics of the resonator. They change the mass of the bridge and change the dynamics of the motion of the top.
That is my theory. It is the only thing that makes sense to me.
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