those familar with these things, got a stupid question for ya. it's part (or shim-w/3 hex screw go through) on top of shroud that goes under the screen, guess so the screen doesn't rub. anyway if ya know what i'm talking about, i think i'm missing one. today putting the shroud back on i only had two but for some reason i keep thinking there should be three of them. it seem little later as was cutting the screen was rubbing (check out tom) but for now idk, if i lost one or what. look at the parts breakdown, that only show one so thought i'd ask, anybody?