Just purchased TRS or TR diss assembled and the seperate gearbox. How can i establish what brand gear box? It is not a built on part of the housing. The part of the transom shield that the drive shaft passes through has been damaged [the drive bellow is placed over this]. I am considering inserting a marine grade allum cylinder through this [tight fit] and have the motor side built up the same circumference as the the original. All this would be welded in place. I would appreciare any thoughts and where would i be able to buy a manual. Thanks in advance.