Add to Cart Quick view Piano Action Handbook Randy Potter MSRP: Now: $18.95 Was: Published by the Piano Technicians Guild. The Piano Action Handbook includes regulating dimensions (key height, sharp height, blow distance, let off, key dip, back check distance and drop) for... MSRP: Now: $18.95 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $18.95 Was: Subtotal: Add to Cart