WHY WE HEAR AN ADDITIONAL UNWANTED BASS SOUND

[themaximillyan]

WHY WE HEAR AN ADDITIONAL UNWANTED BASS SOUND at the moment of striking of the upright piano hammer

In this video, we observe that the 'problem hammer' at the moment of striking the bass double strings, exceeds its own amplitude of motion. Consequently, 'the hammer head felt' has slightly shifted to the left, even making contact with the adjacent bass string. As a result, we hear an additional unwanted sound. The reason the hammer functions poorly is that 'the flange screw' is not properly tightened.
 Here's how to fix it:
 1 Open the top cover of your upright piano (the top board) or the front cover.
2 Remove the upper front board, which is secured in place with two screws.
3 Lift the keyboard cover (fallboard).
4 Insert the screwdriver into 'the flange screw' (located in the action of the upright piano) and turn it clockwise to tighten it. If you move 'the jack of the wippen' to the side, you’ll see the hammer flange screw. Tighten it (without repositioning the hammer; hold 'the hammer head' in place with your fingers while you tighten the screw of 'the hammer flange'), and you’re good to go.
Note: Proceed with caution if attempting to fix it yourself. Additionally, when inserting the screwdriver blade into the screw slot, be careful not to damage 'the jack of the wippen', which is also located in this area. 'The jack of the wippen' should be gently moved aside with the screwdriver before turning 'the flange screw' clockwise. I also want to emphasize the need for adequate lighting, as the flange is located beneath the upright piano hammer, where visibility is poor. It is important to have good lighting when repairing the piano flange. Using an additional lamp or flashlight is recommended to see clearly under the hammers and to avoid any potential damage to the upright piano or personal injury. Safety and accuracy are crucial when performing this fix. If you follow these steps correctly, the unwanted sound should be eliminated.