Action Rail Hole Spacing

[Jon Page]

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 > Use a drafting divider to index on a center line.
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    * If you're implying that the spacing can be taken by measuring the 
centerline


    * width of the section and dividing by the number of unisons (minus one),


    * don't. Most, if not all, traditional upright pianos use greatly 
progressive


    * action center spreads. That is, the action center spacing at the bass 
end of


    * the section will be some wider than the action center spacing at the 
treble


    * end of the section. This is especially so through the bass and tenor


    * sections.



    * Del

If that be the case, then index the holes for the letoff rail by copying 
the spacing of the wippens.
Much the same duplication procedure described in the Renner USA Damper 
Underlever Kit instructions.

If you are unfamiliar with this then cut a strip of Mylar or paper and 
secure to the wippens near
the flanges. Draw a mark on the paper (pin-prick the Mylar) at the left or 
right edges of each wippen.
This will best represent the hole pattern.

You might want to consider waiting until the buttons are installed and 
aligned to the jacks before
drilling for the bracket screws into the rail.

Regards,

Jon Page, piano technician
Harwich Port, Cape Cod, Mass.
mailto:jonpage@comcast.net
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