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| The Inner Workings of One Note In a Grand Piano: |
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| 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 |
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