Accordion Weltmeister How to Repair bass buttons went inside

You need two thin screwdrivers. If I can help, I'm here. The video is without sound, because I have small children and it is too noisy around me, if necessary, I will make a video with audio, I will explain exactly what to do. Once you have inserted the buttons in the corresponding holes and if they do not go inside, you may not need to open the upper metal part of the bass. I do it on the video because there is a button that goes inside.