You will likely loose nothing removing that section. With it all the way left as noted, note that it will cut nothing - it does not travel "into" a guard to create the shearing action. It only moves away from the far end guard. I would assume the next section moves to the right fully into the far end guard to do the actual cutting.Niels Parts knife at far left of its travel, indicating the sickle I propose removing completely.
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My only guess is that that end section might be a "guide" section, to make sure the very end of the knife does not bend up and the next section try to go over the outer guard