A crack can be turned into a neat repair job. A thin piece of horn fitted to the inside curve so it is about 1/4" beyond the split all around and some Copper wire, staples or Iron staples. Heat the base and fit a cone in it but not extremely tight, in other words when soft the crack will close up (if it doesn't wrap a strip of cloth around it and twist it until it does) you do not want to force it open, let it cool, pop it off the cone and make the repair. The base will take a little carving to get the two layers spot to fit.
This is actually easier to do than try to explain.
Tim C.