In the video, we can clearly see that ('The Damper Block') 'the Upright Piano Damper Wedge Felt Strips for Single Bass Dampers' are not evenly positioned in relation to each other. After the hammer strike, 'the damper block' withdraws from the single string, but when the hammer returns to 'the hammer rail', the 'the bass damper felt' doesn't fully lie on the bass string, and both 'the Wedge Felt Strips' don't fully mutes the string there. We can still hear the sound, which should stop completely according to the regulations.

Here's to correct this:

Tools: Tweezers, precision screwdriver

Initially, we can simply separate two neighboring of 'the damper block ' to allow free movement as they most likely moved off during operation. Use our fingers only there. If, after testing, it suddenly turns out that this displacement is happening repeatedly and if they jam between each other again, this should be attempted also:

1 Check the Damper Felt: Examine the damper felt to ensure it's in good condition. Gently realign it with your fingers or tweezers. If it's worn or damaged, replace it.

2 Adjust the Damper Lever: Properly align the damper lever with the string using a screwdriver or the manufacturer's tool. Compare it with neighboring dampers and inspect the damper spring as well.
3 Replace the dysfunctional damper spring. We may slightly bend it towards the strings if it lost its spring tension, which should fix the problem.

4 Inspect the Wippen of the Jack System: Ensure that the wippen and jack system which is responsible for striking the string are correctly aligned and functioning smoothly. Sometimes, pressing 'the damper spoon on the wippen' slightly towards you can improve the damper contact with the string after the key returns to its original position.

5 Align 'the Damper Felt Head': Occasionally, 'the damper felt head' may not align correctly with the strings due to a loose 'the damper screw'. Use a screwdriver with a long, thin tip to gently adjust 'the damper felt head' on 'the damper wire', then securely tighten 'the damper screw'. If, even after tightening 'the damper screw', 'the damper felt head' doesn't sit flat on the string after the hammer strikes it, an issue with the hole of the damper felt head may be suspected. In this case:

1 Remove 'the Damper Felt Head' from 'the Damper Wire'.
2 Find a suitable Shim: Locate a thin piece of plastic, cardboard, rubber, or similar material to use as a shim.
3 Insert the Shim: Place the shim in the hole where the damper felt head was positioned. The shim creates additional friction between the hole of 'the damper block' and 'the damper wire'.
4 Secure the Shim: Ensure the shim is properly installed and secure. Tighten 'the damper screw' to keep the shim in place.
With the shim in position, 'the damper felt head' should now function correctly.

Good luck with your adjustments!

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