I have a set of Bills first cocobolo type slipons with a crack on one side and a piece of the wood totally seperated. It could possibly be epoxied however.
If you would like them for the cost of shipping ($12.50) I will ship them out to you when our postal strike ends. They will come with silver mesh screens.
They may be able to be used as is, and look nice (other then the cracked piece by the hole for the gimbal)
Send me a PM if you want em.... I would prefer to mail em out to someone that would like some nice shells, but cant really afford it.