I shot a two part video on how to take an Echo insert, one of the most used out there, and cut it down to sleeve inside a new wooden exhaust end. I wish I could say it was my idea but it came from another good woodworker that wrote a nice how to but I decided to do videos for the folks that like to see it done.
Here is a link to the first of two parts. This one shows how to turn the insert down and the next which will be up shortly shows how to turn the new wooden bell.
-- Tommy, http://www.followingghost.com