The Inner Workings of One Note
In a Grand Piano:
Click here for animated view
33
48
11
29
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 wire block
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
21. Repetition lever button
22. Wippen spoon
23. Combination jack & repetition lever spring
24. Wippen  
25. Jack regulating button
26. Jack regulating screw
27. Let-off regulating screw
28. Let-off rail
29. Let-off button
30. Let-off button punching
31. Jack
32. Action bracket
33. Damper lift flange
34. Damper lift spring rail   
35. Sostenuto tab or lip   
36. Damper lever
37. Damper lever key cushion
38. Backcheck wire
39. Wippen flange
40. Wippen rail
41. Wippen 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
53. Key stop rail prop  
54. Front rail key pin
55. Front rail punching  
56. Front rail  
57. Sostenuto support bracket
57
Click here to see an upright piano action
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