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I take a different approach on cocobolo. Actually, two different aproaches.
Depending on what the ultimate end use of the call is going to be - a shelf sitter or a field call makes the difference. Sometimes.
Anyway, for field calls I normally just sand the call, apply some teak oil, and then once that is dry, buff it and wax it really well. The new owner of the call can maintain the call for life by simply applying a little good furniture polish and then some wax to the call. The natural oils in cocobolo will help keep the call water resistant and over time, the oils from your hands will seep into the wood also and give it a very nice patina.
The other way is to use a CA Glue finish on the call. There is a tutorial on Filling Grain and Finishing Calls with CA Glue in the tutorial section of the main web site that might be worth checking out.
www.thogamecalls.com and then click on tutorials. It is on the left side of the first page.
CA is a nice finish, very hard and long lasting, but on a field call, it can get scratched like any sit on top finish, poly, lacquer or whatever. But if you follow the tutorial you will get a great smooth finish with the CA glue that will last a long time on a shelf.
Can't help you with the jig and tone board questions because I make predator calls LOL - but you have some of the finest call makers in the world right here that will bend over backwards to help a new guy.
Once again, welcome to our Custom Call Makers Community!
AL @ THO