Restringing U7 has been complete.  It also takes a lot of time to make windings evenly.  It is hard to tell by the picture that the series of the tuning pins structures 6 rows.  And from the bottom, the heights decrease about 1mm to the upper row.  The highest is 27mm on the bottom row and the lowest is 21mm on the top row.  By doing this precisely, the string heights between the tuning pins and the aggraffes are even.  Man, those old craftsmen’s work is amazing.  I measured the original tuning pins before removing them and restored.

I’ve tuned the piano 3 times and still needs more.  Also the piano needs to be played.