I don't know if this will help but Mann came out with a tube kit with foam inserts. I bought one but I don't rember using the inserts. My thought was that if I could figure out how to make some small enough, they would probably be great to insert in a tube and float up under a oak tree or around cypress boles for bluegills / warmouths. They will certainly take fly rod poppers.

Is that a mounted crappie on your thread? If it is it's a really nice display. Hoe big was the fish?

Luther