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In step 3 we put all the bearings in all the pieces, but then in step 10 it mentions putting bearings in again. I tried it the first way, putting bearings in on step 3 and found step 9 to be very hard. I measured the rod that McMaster sent and it measures 2.99-3.02 (depending on how firm I am with the calipers) and the bearings measure 2.99mm so it's possible McMcaster just sent me a rod that's a little too big. Would that 0.02mm be enough to make it impossible to use this rod and slide it through the bearings on the side piece?