The clock ran well until recently when it started slowing down. A sign the glass may be loose in the gear ring (due to cement failure), or binding of the gear ring in the frame.
Notice the electrical tape on the cord which was brittle and the bare wires exposed.
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Although the gear can be purchased separately, I decided to replace the motor as well. Damage to the gears inside the motor case is likely after a long time with gradually increasing binding of the ring.
The two metal pads were each about 0.010″ to 0.015″ thick. Because the drive gear pushes the ring is forced to the left side (as viewed from the front). The left metal pad has worn completely away. A second wear point at about the 7:30 position was also visible on the frame.
Nylon drawer tape was used to fashion new pads. One was placed at the 6:30 position and one at the 8:00 position. The ring (and likely the frame as well) turned out to not be perfectly round. As a result the ring tended to drag against the top of the frame over an arc of movement of about 20 degrees. A third pad at the 12:00 position made the drag worse. The problem was solved by moving the pad to about the 1:30 – 2:00 position.
After installing the new electric cord and motor, and reassembling the glass and hands with new fiber washers, the clock is back to keeping perfect time!
Click here for more on Jefferson Golden Hour Clocks: http://www.roger-russell.com/jeffers/jeffers.htm