setting Notehead for a single chord which follows the custom Notehead

[Ryan Michael]

I am trying to use the triangle notepad for all of the notes in a chord, but would not like the triangle notehead to appear anywhere else in the score. 

I have the following:

%%%%%%%%%%%%
\version "2.18.2"

\relative {
  \set shapeNoteStyles = ##(triangle triangle) 

<d\harmonic g\harmonic>1~ 

<d\harmonic g\harmonic>4 r16. e'32 fis,,8->  r8 b' cis,4. <b'\harmonic e\harmonic>8  

}
%%%%%%%%%%%%

But it appears that this is not how you apply a triangle notehead to just the d and g and just in that chord that immediately follows the setting of the notehead. 

Thanks!

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