Key Bushing(s): Felt inserts at the key front and balance mortises which help to align and guide key travel during play. Key bushings are carefully regulated for minimum resistance or friction during play.
Why Replace these bushings? Asides from alignment, sloppy or excessive side to side motion indicate worn/old/hard and/or improperly installed bushings.
Worn bushings can also make for unpleasant rattles.
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