I had to take all the strings of the kontrabasharpa off, of course, to fit the new tailpiece. This gave me the opportunity to do other little jobs. I wanted to stain the tailpiece black, and thought it would also look quite good if the keybox sides are also stained. I also added a thin strip of fine leather (thanks Kjell Lundvall!) on one of the key retaining strips, to help prevent key rattle. This image also shows the tailpiece extension added, to give a longer rest for the elbow. It’s an extension because a long tailpiece won’t fit in the box I use! Thanks Magnus Holmström for this suggestion, and also for tricks on how to set up the keys properly.
Once it was clear everything would fit OK, the staining could be done and reassembly started.