lamouche

(I'm french, so excuse me for my English) there is a metalic tool, a sort of key ('clé à laine' in french) below my x3 live. It reminds me a tool to correct the fretboard of a guitar. Can someone tell me why Line6 chose to place it there? And what is it for? (You can have a look to the attached photo) Thank you very much for your help! Mario