In the "before" image, you see the trackers to the Chor chest in the right half of the photo. (The trackers in the left half of the photos are part of the Pedal key action, in case you’re curious). The trackers are the off-white fiberglass rods, about 2 millimeters in diameter. They pass through an aluminum rail with felted holes. Clamped to that rail is a long wooden stick (not part of the organ) which was used to mark the locations of all those holes.
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In the "after" picture, you see that the guide rail has been replaced with electro-magnetic actuators (organ builders call them simply “magnets”), each one centered exactly in place of the original guide holes. These are the “pull-downs” referred to in the description of Phase One in the contract. Now each tracker passes through a grommet in a pull-down magnet instead of through a hole in a guide rail. Now each tracker can be pulled down electrically as well as mechanically. It is significant that this addition has had absolutely no effect on the feel or function of the original tracker action
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