What does the first picture show Mark? An adjustable stop that the blade butts up against?
Both of my planers are clam-heads without any setting aid features. I place the blades in and nip up just to pinch them but still allow me to move them then i'll roughly by eye get them all equal and level then using use a short length of wood place it over the cutter head making a pencil mark on the wood inline with the edge of the table then i'll rotate the cutterhead so it picka up the wood and drags it along 5-10mm then make another mark inline with the edge of the table, i'll then move around the head positioning the blades so they all pick up and drag the wood the same distance. I'm sure you've head of this procedure before.
To adjust I'll normally just use a flat head screwdriver with a rubber handle, if they are standing proud i'lll knock them in a bit with the handle, sitting too far in get the screwdriver blade behind and push them forward. It's not a quick method and you'll find that you will have to keep working from one end of the knife to the other to get it right but eventually you'll get there!
On your machine the distance that the blade protrudes from the head is important because if they're set too far out they will remove too much wood meaning that the post cutter feed roller will not make contact with the wood, so the wood will stop feeding once it's past the first roller.
