1956 Evinrude 10HP, Removed the lower unit to repace the water pump impeller...... Now trying to get the lower unit back on..... Cannot get the driveshaft to mesh back into the crankshaft. Of course, there's no way to see into it to ensure that the 4-spline (square) end of the driveshaft is even lining up with the square hole at the bottom of the crankshaft!!! I can get it to within an inch or so, with the water tube into the water pump, and the leg and lower unit are parallel so it "should" drop in, but the prop lust spins (in gear of course) and absolutely will NOT mesh with the crankshaft. I fought with it for hours and shouted all the right obscenities at it!!! Still no go... Am I doing something wrong, or does anyone know a trick or secret way to align the driveshaft to the crankshaft without being able to see any of it, short of pulling the GD powerhead and bolting on the lower unit first???? TIA!!