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NuTone Vintage Door Chime Picture Gallery > NuTone LB42 Westminster 8 Note Chime > NuTone LB42 chime base reverse side of motor wiper arms with arrows.

On the back of the clock motor is the 3 arm wiper assembly.

The blue arrows point to the contact oints on the ends of each arm.

As the clock motor turns (slowly) it turns the wiper arm and the contact point make connections on the circuit board.  This is how the chime rings the tubes in the proper sequence.