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http://www.trekii.com/image-bin/jpgs/KBF-1.jpg
(Photo courtesy of Trek)

Like DownstopFelts, UpstopFelts are fitted to organs with WaterfallKeys. The white keys are in contact with the UpstopFelts when the key is at rest (not depressed).

See ReplacingTheUpstopFelts.

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