The above Photograph shows the position of the C sharp trill key tone
hole. It is the large key
This photoograph shows the actuating lever for the C sharp trill key.
This lever is unusual on
C sharp trills are very common in the States but are almost unknown
in the UK. There are
For more information on this subject go to The FAQ on the Larry Krantz Web Site
The above photograph and notes are as accurate as my knowledge on the subject permits.