  I study, in the leptonic sector, the role of the $SU(2)_V$ custodial symmetry
$\ti{\cal G}$ which was shown in ref. [1] to control the quantization of the
electric charge in the $J=0$ mesonic sector. The electroweak theory is
considered, according to ref. [2], as a purely vectorial model which interacts
with a ``hidden'' sector of composite scalars. $\ti{\cal G}$ can only be a
symmetry of the former if the neutrino is a Majorana particle; the latter
provides a dynamical modification of the leptonic weak couplings,
reconstructing those of the Standard Model with a massless Majorana neutrino.
