The original instrument is with rather short strings, c2=205mm, and is assumed to be tuned at higher pitch, compared with the current standards. In order to tune a1=466Hz, sounding length of strings are modified. Tangents are moved to the left to provide more sounding length of strings. In the original instrument, c-c#-d and eb-e-f-f# are on single string pair. It occupies more space between tangents for one string pair. To accomodate space for tangents of g and above, fretting is modified to c, c# and d to be unfretted and eb-e and f-f# are double fretted. Together with modifying the position of the soundboard bridges, sounding length is extended as c2=246mm.