The thumb key is a notorious trouble spot due to the short length of the mechanism
tubing involved and the action of the player’s thumb at a right angle to the key’s
axis of rotation. Nagahara has developed a more durable, stable mechanism, the Nagahara
Thumb key (US Patent #5,708,226). The secret to this new assembly is the double-
Bellow is a drawing of the special double-
US Patent #5,708,226
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