Grand Piano Action Diagram

Nomenclature

1. String
2. Damper head
3. Damper felt
4. Damper guide rail
5. Damper wire
6. Hammer
7. Hammer shank
8. Drop screw
9. Hammer flange
10. Main action rail
11. Damper stop rail
12. Damper lifter flange
13. Damper wire screw
14. Sostenuto rod
15. Backcheck
16. Hammer rest
17. Repetition lever screw
18. Repetition lever flange
19. Repetition lever
20. Hammer knuckle (Roller)
21. Repetition lever button
22. Wipon spoon
23. Combination jack spring and repetition lever spring
24. Wipon
25. Jack regulating button
26. Jack regulating screw
27. Letoff regulating screw
28. Letoff Rail
29. Letoff button
30. Letoff button punching
31. Jack
32. Action bracket
33. Damper lever flange
34. Damper lift rail spring
35. Sostenuto tab or lip
36. Damper lever
37. Damper lever key cushion
38. Backcheck wire
39. Wipon flange
40. Wipon rail
41. Wipon cushion
42. Capstan screw
43. Key button
44. Balance rail key pin
45. Key
46. Key stop rail
47. Damper lift rail
48. Back rail
49. Back rail cloth
50. Key frame
51. Balance rail
52. Balance rail bearing (washer)
53. Key stop rail prop
54. Front rail key pin
55. Front rail punching (washer)
56. Front rail