I was zipping along set to replace the chopper assembly on my Kitchenaid dishwasher when I got stuck because I cannot get the inlet protector off. I removed the screw to the left which is the only one I see, but it won't budge. Any advice?

Also, the foreign object protector that is showed in the diagrams doesn't seemed to exist in my dishwasher. I've never had it repaired, so I'm puzzling why it doesn't have one.