picky, picky, picky... '-] David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "John Delacour" <JD at Pianomaker.co.uk> To: pianotech at ptg.org; caut at ptg.org Received: 4/22/2010 12:58:26 AM Subject: Re: [pianotech] restoration >At 15:39 -0700 21/4/10, David Ilvedson wrote: >>These YouTube videos of a Steingrabber & Sohn upright is well >>done...good craftsmanship. In the 2nd one he uses 30% hydrogen >>peroxide in the Sun to whiten the ivories >The prior sanding of the ivories was quite unnecessary. The job >could have been done with just peroxide (the cream, as I said, is >more convenient and labour-saving) and the ivory polished afterwards. >This way you lose no thickness of ivory. A few months ago I bleached >a set that was far worse than this Steingraeber without needing to do >any sanding. I don't use a buffing wheel to polish the ivory either >since that abrades the softer "summer growth" more than the harder >parts and it is always detectable. After bleaching I remove any >scratches with P800 - 1200 wet-n-dry and then polish with chalk and >alcohol on a hard block covered with white sheep leather. It's >almost as quick and leaves a glass-like surface. >I found his way of removing the chase bushings painfully slow and >inefficient. All he needed to do was soak them and leave them for a >bit before pulling them out clean with small flat-nose pliers. No >chisels (I noticed his knife was terribly blunt -- cfr. our Moroccan >turner's perfect chisel) no files. His glue was also overcooked and >sticky. >JD
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