The set screw in the brushplate is to adjust the up-and-down play of the armature.
The diagram showing the lube put into the hole is for a more modern motor without the set screw. You can oil the top bearing of the armature by removing the setscrew. Replace the setscrew until it contacts the armature shaft, then unscrew it about a half turn and run the motor.
Larry
The diagram showing the lube put into the hole is for a more modern motor without the set screw. You can oil the top bearing of the armature by removing the setscrew. Replace the setscrew until it contacts the armature shaft, then unscrew it about a half turn and run the motor.
Larry