Abstract: Aspects of the present invention provide relatively inexpensive methods and apparatus for modifying existing pianos to provide interchangeable keyboards of different sizes without sacrificing or impairing the quality of the original piano. The keys of a standard piano are removed and the pins in the front rail of the key frame are replaced with pins which are more closely positioned. The original keys are then replaced with new keys of narrower dimensions which are more closely positioned in the area of the front rail.

Abstract: An escapement action for a piano includes a hammershank having a first end mounted to pivot relative to the piano and a second end carrying a hammer to strike a tensioned string of the piano, with a knuckle disposed therealong between the first and second ends. A repetition support bearing against a key of the piano is mounted to pivot relative to the piano in response to depression of the key. A jack has a first portion extending from a pivot connection with the repetition support and defines a jack surface disposed for engagement with a knuckle surface, the jack arranged for escape of the jack surface from engagement with the knuckle surface during depression of the key. A spring urges the jack toward an "at rest" position with the jack surface in engagement with the knuckle surface. A jack retainer assembly dependent from the hammershank between the second end and the knuckle includes a cushion surface positioned to retain the jack in "at rest" position in opposition to force of the spring.