Then Extrude the main body of the blade.
Adjust on X with scale non-uniform.
Select the faces in red and ajust the dimensions using a scale non-uniform on the y axis.
Adjust the vertexes like above.
Insert a vertex into the edge as shown with the 3d Snap on set to Midpoint, hide the 2 edges and make visible the 2 others.
Select the faces as in the picture and then follow a series of Extrude/Bevel to create the edge and another for the hollow.
On the point, make the horizontal edge like above.
Then move the vertexes downwards.
Lastly, make visible the 2 edges like opposite.
For drillings, select a quad as shown, use Extrude/Bevel and adjust the vertexes to have a square.
Extrude again into negative for the hole.
Start again for the second hole.
Finally remove the horizontal edges. That gives a better smoothing with Meshsmooth in this case.
For the blade, always Extrude/Bevel as shown
Extrude the faces to build the blade.
Adjust the vertexes on the top of the blade as shown above and continue to align the others perfectly
When it come sot the point of the support of the blade.
select the vertexes in red and made a scale non-uniform on the axis Y.
Adjust the vertices on the y axis to obtain the horizontal row
Then extrude the remainder of the blade and use scales non-uniforms for the point.
Adjust the edges at the point of the support of the blade to obtain the structure above.