[pianotech] hitch pin hole

[Overs Pianos]

Ed,

As Del writes, very likely a gas pocket. If a 
larger pin is collapsing again it will probably 
need to be a case of moving the pin to 'fresh 
pastures'.

During one of the early Sydney piano competitions 
(1981 or 1985 - two comps for which I was 
preparing the Bösendorfer), one of the other 
company's pianos developed a crack which ran from 
the hitch pin to the edge of the plate adjacent 
to the long bridge. Once the problem was pointed 
out to the company's tech, there was much 
wringing of hands. The first decision was fly out 
another example of the piano for the event. 
However, when the replacement arrived it was 
clearly tonally inferior to the originally 
supplied piano. So the company decided to 
relocate of offending hitch further back in the 
plate, after which both pianos were provided for 
the competition. At the conclusion of the comp 
both were returned to the factory.

Ron O.

>I haven't had it happen to me either but I've 
>heard of it happening. Two possible causes come 
>to mind. You say it's an expensive grand so it 
>probably has a green-sand cast plate. 
>Occasionally bits-as in very small clumps-of 
>sand break loose from somewhere and get into the 
>casting. To me this seems most likely. The other 
>possibility is an internal gas (air) pocket. I'd 
>think you'd have discovered that the first time 
>around, though.
>
>ddf
>
>Delwin D Fandrich
>Piano Design & Fabrication
>6939 Foothill Court SW, Olympia, Washington 98512 USA
>Phone  360.515.0119 - Cell  360.388.6525
><mailto:del at fandrichpiano.com>del at fandrichpiano.com 
>- 
><mailto:ddfandrich at gmail.com>ddfandrich at gmail.com
>
>From: pianotech-bounces at ptg.org 
>[mailto:pianotech-bounces at ptg.org] On Behalf Of 
>Ed Foote
>Sent: Saturday, December 03, 2011 5:49 AM
>To: pianotech at ptg.org
>Subject: [pianotech] hitch pin hole
>
>Greetings,
>
>Three years ago, I had a hitch pin begin to give 
>way in the plate of a rather expen$ive grand. It 
>seems that there was a pocket of something other 
>than cast iron at the particular spot (Eb55). 
>It was under warranty.  Factory recommendation 
>was to install a larger pin, which I did while 
>accompanied by the dealer's technician.  Now, I 
>get a call that the note is once again totally 
>whacked out and I fear that the pin is once 
>again beginning to lean into the string's pull. 
> I think the ultimate solution would be to drill 
>a new hole perhaps an inch farther distally and 
>just avoid the area.  Anybody else deal with 
>something like this?  First time in 35 years I 
>have encountered the situation.
>Thanks,
>
>Ed Foote RPT
><http://www.piano-tuners.org/edfoote/index.html>http://www.piano-tuners.org/edfoote/index.html
>
>


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