Hello,

all you need to do is to hook the strings back to it's correct position. To achieve this, you will have to disassemble the unit.

Get a Phillips screw driver that can fit into the screws, carefully unscrew the screws in order to take the unit apart.

Get to the turner area, remove it and put the string back. This is the only option you have.

If there was a replacement for the turner, I would have recommended a replacement, but unfortunately, there is no turner replacement for this unit.

Good luck.