Thor, I can't imaging how your mast would crack like that. I am having a hard time imagining how a mast could be stressed to create a crack running vertically below the deck. Are you sure it isn't just a scratch? Someone with a big belt buckle using the head? A crack that long should easily be moved by pressing on one side or the other. The other test would be to find someone that could NDI it with some dye penetrant and a black light. Good luck!
