I bought a used tracker aluminum boat a couple weeks ago and need some tips on sealing some old screw holes. The previous owner removed his fish finder transducer before selling the boat and left the brackets behind. Problem is my transducer needs to be mounted in the same location, but doesn't match up with the holes on the old bracket, so I'm going to need to drill new mounting holes. Would it be possible to seal them using a mapp gas torch and brazing rods? I don't own a welding machine or an oxyacetylene torch.