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Max is glad that we were able to understand and identify the issue with the hammer not contacting the string when an adjacent key is pressed. We hope that the situation will improve soon, and the hammer will interact correctly with the string during play. I dare to assume that you can fix this your...

No denying it wants some TLC, although for the hammer to miss the damper, it would need to be barely striking the left string and touching the next set along - see photo of one gently aligned with the side of the damper:

Thank you for your reply - in better light and a new angle, I have found that you are correct in your first suggestion: the hammer is making contact with the top right corner of the adjacent damper head - photo shows where corners have been rubbed clean by the hammer felts

On a 1900s Bechstein Upright, I have an issue with the action where a hammer is not hitting the strings if the adjacent note to the left already pressed. This is affecting approximately 1 octave range. Interestingly if the note to the right is down instead, there’s no issue. Advice would be much app...