Guessing a Alpha1 , How hard its it to follow Seloc directions, "Place manual on ground , kneel on it"
With the control box in fwd gear and the impeller prelubed and water inlet bushing slightly greased
Place lower unit in fwd gear by rotating the splined shaft fully CW
Raise drive up , slightly turning propeller CCW to rotate driveshaft splines untill splines engage
Make sure lower brass shoe locates correctly on the splines in the lower shaft and is in a straight line "fwd gear"
Install side nuts and snug, making sure upper and lower shoes mate correctly install remaining nuts
Fill with oil from the bottom