Think you're ok, verified in two other places, so good chance it's an error.Thanks flitecontrol. I have that manual as well and there's no mention of it there. Exploded parts diagram (either manual or Partzilla) doesn't show washers there, either. I may just cross that line out of my manual...?
I've found some critical errors in the Haynes manuals also, for car engines. Did what you did, verified in other manuals and the internet.
Makes it tough to just take their word on everything.