After pearl rotates for 180 o, pull (1) hand towards motor, then begin to drill hole until the pearl is holed through.

珍珠翻转180度以后，向电机方向扳动1手柄，再次实施打孔，通孔即完成。

youdao

After pearl rotates for 180 o, pull (1) hand towards motor, then begin to drill hole until the pearl is holed through.

珍珠翻转180度以后，向电机方向扳动1手柄，再次实施打孔，通孔即完成。

youdao