Cointerra Terraminer quick question

[SCASICS]

Hi guys,  I have a quick question about the sequence of the washers/nut  on the fans in the Terraminer. Basicly from the inside, the fan , what is the next washer? is it the flat one? the plastic one? or the spring looking washer? also from the outside also, before the grill, is there a washer I need to put back on? Any help would be greatly appreciated