[OMC-Boats] Prop Install Question

This might seem like a simplistic question but I've not owned an OMC before and just want to be sure....

I bought a refurbished prop for my '70 Evinrude Explorer OMC sterndrive from a local prop store. The prop slips on down to about 1" above the shear pin hole. As shown in the attached pic, the shaft is smooth with no "key" guide but does have a raised section or lip at the base (circled). The prop is smooth but has a key guide. The prop has the correct part number stamped on it but that doesn't necessarily mean the hub is correct.

In sliding the prop down the shaft the backside of the prop will slip over the lip on the shaft where it meets resistance after about 1/4 inch travel. With just slight downward hand pressure it will wedge tight and is difficult to get off by hand if need be. I'm a bit concerned the resistance and the potential of not getting the shear pin hole lined up and then not being able to get the prop back off again by hand if it's off slightly.

Couple of questions:
1) should the shaft/prop be lubed when installing?
2) is the prop "supposed" to slip all the way down and seat with minimal effort or does it require being tapped down?
3) I think I'm missing a large washer that fits under the cone cap. Anyone have a schematic view of the applicable parts (I don't have a manual yet)?

Thanks for the assist!
 
-Bill
Dallas, TX
1970 Evinrude Explorer - 155 Buick V6 OMC
http://photobucket.com/Evinrude_Explorer