override NoteHead size for one not in a chord

[Ryan Michael]

I have a chord and I am trying to make the last note, which happens to also be in parenthesize, to have a small Font-size for the notehead. 

Here is my lily code :

\tuplet 3/2{<des aes'\harmonic \parenthesize 

\once  \override NoteHead.font-size = #-4

aes'>32 ees'16\harmonic } 

which currently just renders the same font-size for all notes (the default size)

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