I took this picture while I was in the middle of stringing a bowed psaltery. With ball-end strings, this is a fairly straight-forward affair. All the tools that are needed are a needle-nose pliers and a tuner. I also use a contact mic clipped somewhere onto the psaltery to increase the tuner’s response and accuracy.

Also, I really like using an extra long T-handle tuning wrench for winding the string on the pins and for the initial tuning. The extra leverage reduces stress on the wrist, and generally makes things go smoother.