Flag poling Petrof pins?

[jolly roger]

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Hi Ron,
               I would not be surprised if there was a poor pin block to 
flange fit.  Particularly if it's a newer instrument.

Regards Roger


At 09:52 PM 8/14/02 -0500, you wrote:
>I don't have any information specific to the Petrof, but in general...
>
>>Stability seems to be a problem.  This piano has an open faced pin block 
>>which means that the pins stand upright and do not lean back as in a 
>>conventional design.  The coils stand 1/4" - 3/8" above the block.  The 
>>hypothesis is that the pins may be bending excessively due to the high 
>>coils, making setting the pins more difficult.
>>A possible cure would be to simply set the pins deeper into the 
>>block,  although this is speculative theory, (particularly since this is 
>>how it was designed).  Additionally this would add friction to the pins 
>>which may contribute or create a new problem.
>
>
>I wasn't aware that open face meant the pins stand upright instead of 
>leaning back, but there are a lot of things I don't know and that isn't 
>the problem in any case. Is the problem really with tuning stability, or 
>getting a solid tuning in the first place? These are entirely different 
>things, and driving pins won't improve tuning stability. It will, however, 
>give you a little better control for getting the string settled in. An 
>open face block with the coil 3/8" above the block shouldn't tune any 
>differently than a piano with a non-bushed plate with the coil 1/8" above 
>the 1/4" thick webbing, so if you don't characteristically have trouble 
>with that very common type, the Petrof shouldn't be a problem either - 
>unless that's not the problem. How tight are the pins already? What's 
>unstable about the tuning? Unisons, overall pitch drift in certain 
>specific areas? Do the strings render well across the bearing points while 
>you're tuning? Hot lights?
>
>
>Ron N


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