[RustyPile]

The NSS is actually two switches with two independent circuits. The ignition switch sends power to the purple wire when in the START position only. The NSS portion of the switch interrupts the current flow to the starter in all positions except neutral and park. The other part of the NSS is for the backup lights only. With the ignition switch in the ON position, it provides power to certain circuits on the fuse box. The dark green wire at the NSS comes from the fuse box and the light green wire goes directly to the back-up lights..

After disturbing the NSS, the starter wouldn't engage because the slight movement put the switch out of (your words) "the sweet spot"... Normally, when the NSS is out of adjustment, starter doesn't engage AND the backup lights don't work.. You might try adjusting it, but probably the switch is bad...