Looks good! (there are two of them, one each side).
The end opposite the spring should have a nice clean curve where it meets the motor commutator.
Might try giving the power switch a few dozen flicks on/off (unplugged) to maybe wake it up.
George is right about the switches on many routers. My table router (Milwaukee) also sits on all the time with an external power switch and sometimes it will not run until I give it a blow out and flick the switch around.