"Art Ransom" wrote in message
. ..
Presently I am using the birdmouth and have used it with columns up to 16"
in diameter. I am interested in the bead and cove because it would give
me
more flexibility in the number of staves.

You can use the bird's mouth for any number of staves, you just need to
carefully calculate (or draw) the angle of the female part.

Tim W