  The evaluation of sum rules and vacuum condensates used in the calculation of
the mixing parameters of the $\omega -\rho$ system involve dangerous
cancellations of large numbers. In this note the contribution of the continuum
is eliminated in order to avoid such a large source of uncertainty. It is also
seen that the hypothesis of vacuum saturation used in the estimate of the
dimension 6 condensate is inadequate. The value obtained for the parameter
$\beta$ which governs the off-shell variation of the $\omega -\rho$ mixing is
$\beta=.25$.
