Phoinix, these reduce the "tennis raquet" effect. Each tail rotor blade occupies a radial segment of tail rotor disc, rather than the ideal radial line. The centrifugal force (in the blade reference coord system) is thus trying to flatten out the blades in rotor plane. The weights are also trying to lie in plane, so that the two resulting pitch torques cancel. This just keeps the pedal forces sensible.
Hope that helps!