Hey Ag. Can you post a picture on here? That would help out a lot. The bottom fin on the gearcase is called the 'skeg'. They are made from aluminum and can be repaired. Depending on how much damage you did, it might be fixable, but you will need to take it to a GOOD aluminum welder. Any old welding shop will not do for this. If you actually removed part of the gearcase, I doubt it can be fixed. You may have to find a used lower unit.