I went back to the picture in Bod Mannels book and used magnifier to take close look at the points plate attaching screws. Missed it on first look but indeed, the two plate attaching screws used a split washer, just like the picture you posted!
Am looking at the bottom side of the screws used to secure the points. From your picture, there appears to be a slight shoulder under the surface of the screw. Gotta go out to the cave and take look at the points screws I have to see if they are correct...Jim C always used to say I was just a bit Anal on stuff never see. Yep.