  An explicit retrocausal model is used to analyze the general Wood-Spekkens
argument [1] that any causal explanation of Bell-inequality violations must be
unnaturally fine-tuned to avoid signaling. The no-signaling aspects of the
model turn out to be robust under variation of the only free parameter, even as
the probabilities deviate from standard quantum theory. The ultimate reason for
this robustness is then traced to a symmetry assumed by the original model. A
broader conclusion is that symmetry-based restrictions seem a natural and
acceptable form of fine-tuning, not an unnatural model-rigging. And if the
Wood-Spekkens argument is indicating the presence of hidden symmetries, this
might even be interpreted as supporting time-symmetric retrocausal models.
