Let-off, also known as escapement, is the mechanism of the hammer releasing from the jack and lower action when the key is struck. It is a critical part of the action mechanism, and very influential in the touch and feel of the piano. It is sometimes called ‘set-off’ in the UK. Function: Let-off is designed […]

A jack is the L shaped component that is found in piano actions, and the whip assembly in Wurlitzer pianos. In Wurlitzer pianos, it is commonly known as the fly – but the two terms are interchangable. Function: The jack plays a crucial roll in let-off, a major part of the action process when the […]