Voicing (Hammer soft acupuncture)

Maintenance of grand piano stringing machine drum wheel (Knuckle) and top bar (Jack)
The wear and aging of the grand piano drum wheel (Knuckle) and the top rod (Jack) seriously affect the feeling of touching the keys. Vaseline and graphite are applied for maintenance. ( Replace the best when necessary)
三角钢琴击弦机鼓轮(Knuckle)及顶杆(Jack)磨损老化严重影响琴键触后感觉,涂抹凡士林和石墨给予维护保养。(必要时更换最佳)

New York Piano Tuner ( Chen YN 调音主页)