The twist-four, spin-two effects on the second Nachtmann moment in electroproduction have been calculated using the operator product expansion. To explore the model dependence of the nucleon matrix elements of the operators, proton and neutron wave functions from several different models of quark confinement were considered. While the twist-four, spin-two effects were indeed found to be substantially model-dependent, thery were small (⪕2%) in all cases, confirming the conclusions of Jaffe and Soldate, based on the MIT bag model.