FJV Grand Backcheck Angle GaugeFor adjusting the catching distance of hammers, the technician moves the backchecks back and forth to achieve a half inch distance between the hammer and the strings. However, this usual method changes the angle of the checks, significantly affecting its behaviour and efficiency. We need to take care of it. For manuals please follow https: www. pianodesign. ch tools A little introduction to FJV Franois Jrme has extensive global experience in
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