  With the unique advantage that radio galaxies have in delineating the central
super-massive black hole axis along their radio axes they make useful probes
for unseen central engine processes. In this paper I bring to attention the
remarkable power of low axial ratio radio galaxy samples in opening up for
examination this hard-to-probe regime of active galaxies. I present results
from our recent EVLA observations of a large radio source sample originally
selected on the basis of shapes. The observations have revealed a plethora of
radio sources that potentially show signatures of axis changes of various types
suggesting such samples as effective means for probing black hole axis
perturbations and hence such samples to be effective means in searches for
binary black hole pairs in radio galaxies.
