We present an extension of the left-right-symmetric model by including extra singlet quarks and leptons, which leads to calculable WL-WR mixing and an ultralight Dirac mass for the neutrino. For a WR mass in the tera-electron-volt range, the neutrino masses can be in the right range to explain the solar neutrino puzzle via the Mikheyev-Smirnov-Wolfenstein oscillation amplification mechanism. Crucial for our results is a ``see-saw''-type mechanism for the smallness of the d-quark masses.
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Chang et al. (1987) studied this question.
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