“The recorder is a finished object. It has to withstand the constant pressure of moisture and drying. The primary elements that are decisive for the quality of the recorder are beyond the reach of the player, hidden in the core of the instrument. Even if the block is removed, the fine points that distinguish between good and bad can hardly be measured and are therefore not visible. A light stroke with a file, broach or sandpaper can make all the difference between success or failure.”—Heinz Ammann