In this third paper of the triptych we use the Tinoco-Woody model of an electron on a helix as our chiral system [I. Tinoco, Jr. and R. W. Woody, J. Chem. Phys. 40, 160 (1964)]. Diastereomerism is achieved by varying the pitch of the helix. The full nuclear magnetic shielding tensor of a naked spin is determined with various subtleties explicated. The results are compared to the Ne helix diastereomers. (C) 2003 American Institute of Physics.