Steve Dibble
Pianola Restoration.
Hopkinson Player Action
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An unusual design and U.S. made vertical arrangement of the striker pneumatics, making the stack much more compact.

The lead tubing had completely rotted through. My  remedy is pictured below.

The completed stack, this is a surprisingly  powerful and sensitive instrument for it’s size.

Adjustments for lost motion between pneumatic finger and action lever. Also showing the backcheck adjusters. Much simpler and easier to work on than many I have seen.

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