Right... to make the blade attach-er, I spline/patched again. This time, I drew a red "Donut" shape on the gird, and used 3d-snap, snapping to edges, to draw the different splines.
The only thing you want to keep in mind is that you have to draw the different splines with the same number of verticies, and in the same "pattern", so the vertex numbers line up from layer to layer, as in the picture. I did it in three sections, and attached the sections by cutting away polygons and welding verticies by hand. You should be familiar with the CrossSection modifier, if you want to switch to MAX...