Well I took my Alpha one lower unit apart. Bought all the correct tools and they really did great with the disassemble. When I removed the spanner nut around the prop shaft almost all the threads were corroded away. So instead of spending a bunch of money on a 40 year old unit I've decided to buy a new one. SEI makes an aftermarket one with a three year no-fault warranty. Price is 925.00 plus tax and shipping. Has anybody bought or have one, any thoughts?