Category Archives: Technical

Short articles on various aspects of repair, maintenance, tuning, voicing, etc.

Key Spacing – Sharps


Once re-bushed, all keys (naturals & sharps) may need some fine spacing. This is best done prior to key levelling. The sharps are classically spaced very slightly towards the centre of the keyboard, bearing in mind that the movement of … Continue reading

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Hammer Felt Trimming


When hammer heads are angled on their shanks, they can sometimes require trimming (bevelling) to give clearance. I’ve posted on this previously (Hammer Cutting) but these pics show more clearly how to select the required angle (the amount) of bevelling: … Continue reading

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Upright Damper Regulation – Hoffmann


First, all damper felts need to be trimmed and/or cleaned. I clean the felts using compressed air – it’s a delicate operation, but well worth the careful effort. Trimming damper felts requires a perfect pair of scissors. Previous posts have … Continue reading

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Damper Wobble Noise


Sometimes dampers wobble as the key is pressed, especially on a hard blow, and can actually produce an audible vibration (a strange and annoying sound). Dampers with extended wires (usually at tenor/bass breaks) are particularly prone to this. There are … Continue reading

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Dome Screw Adjustment


Many quality keyframes have Dome Screws to adjust how the frame rests on the keybed. Most dome screws are adjusted using a tuning hammer or special key. Many Piano People do this on the work bench, using a straight-edge; some … Continue reading

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Steinways Losing Weight


Size isn’t everything in the piano world….Because, though these hammers had a very good felt length and the correct width, they were far too HEAVY. This early model O Steinway also lives in a Romney Marsh church, so stiff keys … Continue reading

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Harpsichord Voicing: 1984 Horniblow


Harpsichord voicing, like FortePiano (Early Piano) voicing, is much more closely linked to the instrument’s regulation. The process and principles of voicing, though, are the same for any instrument: giving form and equally graded variability to each and every note, … Continue reading

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