US / North America

Leece Neville 132-SN-24-32V engine start switch

Pennsylvania Trolley Museum, Inc. is preserving a 1942 Porter diesel loco. It uses L-N 132-SN-24-32V two stage engine start switches. The first stage contact in both of them have failed. This was supposed to use a low voltage battery tap to ease the starter pinion into engagement before full voltage is applied to the starter by the 2nd stage contact. Are parts for this switch available? Lacking that, can drawings be obtained from which PTM can make our own repair parts? It's hard on the starters to get full voltage, so we need to fix the start switches.
Thanks for any help.