Below is a side view closeup of the R3 kicker in the raised position, showing a cushion embedded in the Grenadilla body to silence the action. In later flutes Berteling inserted a leaf spring between the kicker and the end of the adjusting screw, resulting in less concentrated wear and more stable action. Even without these, this flute has not needed adjustment after several generations of neglect. The dome crown is female threaded to mate with the wooden screw cork adjuster and perforated for the metal pin cork position indicator. Trill key spring arrangement is unique, with the attachment point being an extension of the upper post of the left hand mechanism which also stabilizes the trill rod.
Tone holes are countersunk and beveled to a sharp rim at the pad seat.
A student brought this, his grandfather's flute, to the attention of his flute teacher, who then acquired it. The only alteration was the removal of the palm crutch receiver and filling of the screw holes.