I have decided to get rid of some mouthpieces I have collected over the years. However, I have a brilhart tonalin alto and tenor and they both have a crack on the inside where the facing is. The cracks do not go all the way through and both are about an inch from the shank. I also have a Brilhart tonalin, tenor, that is the English version (ROC) with the metal band. It too has a crack similar to the others. I am wondering what they are worth as is, or if it would be worthwhile to somehow fix those cracks before they got worse? Any advice would be appreciated.