  In this paper, we apply results of \cite{Va3} and use towers to transfer
symmetry from $\mu^+$ down to $\mu$ in superstable abstract elementary classes
without using extra set-theoretic assumptions or tameness.
  Theorem. Suppose $\mathcal{K}$ is an abstract elementary class satisfying the
amalgamation and joint embedding properties and that $\mathcal{K}$ is both
$\mu$- and $\mu^+$-superstable. If $\mathcal{K}$ has symmetry for
non-$\mu^+$-splitting, then $\mathcal{K}$ has symmetry for non-$\mu$-splitting.
  This is a new application of towers which were introduced by Shelah and
Villaveces \cite{ShVi} and later used by VanDieren \cite{Va1}, \cite{Va2} and
Grossberg, VanDieren, and Villaveces \cite{GVV} to prove the uniqueness of
limit models.
