notes for toms and floortoms

[Herman]

Hi All,

I am working on a drumbook using lilypond. I very much like the convention as it
is used by Rick Latham in his books (advanced funk studies, and contemporary
drumset techniques)

Here a tom is an open circle with a line through it. Check this link for qaan
example

http://drummerworld.com/Drumclinic/Rick_LathamDT.html

I looked in lilypond if this symbol is available, but I coudn't find it. Is
there a way to generate it?

Best regards
Herman