It looks like the washer got pinched. If I were you, I wouldn't worry too much about it.
About blade centering, try the link here, especially post #3 by LowTEC; it worked for my Millie orange.
About blade centering, try the link here, especially post #3 by LowTEC; it worked for my Millie orange.
Well I took it apart. One of the washers has some damage. I took some pictures, but my camera sucks. It looks like something was trying to go through the washer but the washer was not centered and therefore a small lip was formed.