Ignition Switch and/or Schematic Troy-Bilt Chipper/Vac Model 47287

I'm attempting to find a replacement ignition switch (part #1902790) for my Troy-Bilt chipper/vac model 47287, serial # 472870205985...or a schematic showing the wiring for the M1 and M2 terminals on the original ignition switch. The inherited chipper came minus the key.