  The motion of spinning test particles along circular orbits in static vacuum
spacetimes belonging to the Weyl class is discussed. Spin alignment and
coupling with background parameters in the case of superimposed Weyl fields,
corresponding to a single Schwarzschild black hole and single Chazy-Curzon
particle as well as to two Schwarzschild black holes and two Chazy-Curzon
particles, are studied in detail for standard choices of supplementary
conditions. Applications to the gravitomagnetic "clock effect" are also
discussed.
