I'm not a big fan of buying something that I can make myself, so today I decided to grab some delrin off the shelf and make a tone board I can use as a master. In less than 30 minutes of filing and wet sanding I had the sound I wanted. I also cut a groove to allow the use of an o-ring to keep it tight in the Call barrel. I went with a thin notch, so I wouldn't have to use a wedge or anything.