Tuplet number note size/font

[Andrew Bernard]

I am trying to use notes in tuplet numbers, fairly standard. I use a 
custom font for my scores and this may be interfering, but when I use 
say 16. or 8 for the note the stem length is almost zero and it looks ugly.

How can I get access to the font used in tuplet numbers for the notes 
when you use them, as per the non-default tuplet number examples?

Andrew