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The diagram only shows the assembly of one side of the head and you need to do exacly the same on both sides of the blade pivot shaft. You should obvioulsy have 2 of everything shown in the picture. As for S3364 the diagram has 3 arrows, but this is considered as one bearing, so 2 is the correct amount, one for each side. Do be careful with this bearing as one of the carrier plates has a smaller internal diameter than the other and this one should be one the outside i.e. last to go on.
good luck with the build, you'll love it when you fly it, especially of you choose a brushless motor and lipos for the extra power.
He who dies with the most toys is the winner!