<html> <body> Xavier, The distances between the holes is determined by the string spacing.  It is different for every piano design. You should duplicate the old rail spacing, or make a scale stick of the strings at the strike point. Don Mannino RPT At 02:09 PM 3/29/2004, you wrote: <blockquote type=cite class=cite cite>Ok. sorry, the little hole in the action rail  were they are placed wippen, hammer and dampers  .....wath is the distance between hole in m.m. or c.m. ? in  upright...of course. I am a piano technician from guayaquil ecuador, and I  make big work in old pianos, pinblock ....replacement, and more.....but the hole in the action rail  is headache for my...85 hole for the hammer.....back 85 for the wippen  and the hole for the damper. <a href="http://www.latinmail.com/" eudora="autourl">http://www.latinmai= l.com</a> - La forma más cómoda de enviar y recibir tus= e-mails_______________________________________________ pianotech list info: <a href="http://www.ptg.org/mailman/listinfo/pianotec= h"= eudora="autourl">https://www.moypiano.com/resources/#archives</a>= </blockquote></body> </html>