  The fine-tuning principles are analyzed in search for estimations of heavy
particle masses in the left-right (LR) symmetric model. The modification of
Veltman condition based on the hypothesis of the compensation between fermion
and boson vacuum energies within the LR Model multiplets is proposed. The
hypothesis is supplied with the requirement of the stability under rescaling.
With regard to these requirements the necessity of existence of right-handed
Majorana neutrinos with masses of order of right-handed gauge bosons is shown
and estimations on the top-quark mass which are in a good agreement with the
experimental value are obtained.
