You'll need a #2 Phillips screwdriver.
With the flyer assembly installed, make sure the front and rear maidens are vertical and pushed against their stops. Secure the maidens with the quick release levers. To check the placement of the rear bearing, slide the flyer assembly to the rear. Check to see that there is small gap between the shoulder on the flyer shaft and the orifice (front) bearing.
If the flyer doesn’t move and there is no gap, you will need to reposition the rear bearing. Loosen the screw in the side of the rear maiden. Slide the flyer to the rear about 1/16" to create a space between the flyer shaft shoulder and the orifice bearing. Tighten the screw to secure the rear bearing.