Tweaking individual notehead's size in a chord

[Daniel Tonda Castillo]

Hello:

I do not find a way to tweak the size of an individual notehead in a 
chord. So that one of the notes in a chord would appear as smaller than 
the rest of the notes. I would assume that something similar to this 
would suffice but no:

<c e \tweak #fontSize #-2 g>

Is it possible to do so? I can affect the color, but I do not know the 
property name for the size of a notehead in a chord. Tried: fontSize, 
font-size; size.

Thanks!

Daniel Tonda Castillo

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