after changing lower unit lube, i noticed a crack about 2 inches long extending back to exhaust opening on bullit the crack is not all the way through, this skeg looks like it has been modified at some point, ( the boat was 6 mts old when i purchased it from a used car lot in kentucky) the skeg looks to have been extended about 3 inches back to the exhaust opening, in fact when running a 28 chopper 11 there is only 1/4 inch clearance to prop blade, is this crack repairable, and who would you guys recomend. also the crack is right where the skeg attaches to the bullit.