recorder fingering chart

[Libero Mureddu]

Hi,
I'm writing a chart for recorder fingering, and I'm using the standard
lilypond fingering instructions. However, I should use the slashed
numbers too in order to indicate half-hole positions.
Is it possible to use slashed numbers in fingering (without using \markup)?
or
can someone show me how to use the slashed-digit inside a markup? I
always get some errors.

Thanks a lot and regards,
libero

-- 
Libero Mureddu
http://webusers.siba.fi/~limuredd/
http://www.myspace.com/liberomureddu