How to change TabNoteHead

[Rachael Thomas Carlson]

Hello:

I am attempting to change the TabNoteHead through what the 
documentation calls 'Modifying stencils' (chp. 5.5.3).  I can't seem to 
get the stencil override to work.  I have been able to change the 
TabNoteHead through the use of postscript like in one of the snippets 
(http://lsr.dsi.unimi.it/LSR/Item?id=516) but I would rather use the 
musicglyphs in the Feta font than have to manually create each object.

With that being said, I would love to be able to change the 
TabNoteHead by any means.  \deadNotes looks great but I need more 
options.

I have attached a png of what I am attempting.

Here is the code that does not work for me:

\version "2.16.2"

tick = {
        \once \override TabNoteHead #'stencil = #ly:text-interface::print
        \once \override TabNoteHead #'text = \markup { \musicglyph 
#"noteheads.s0la" } 
}

\new TabStaff {
        c8 \tick c8 c8 c8 }

Thank you kindly,
Rachael

snapshot1.png
Description: PNG image