The MoYu Adjustment Tool is a simple new tool that allows you to easily and precisely adjust the tensions on your MoYu cubes that use the YueXiao style core, including GuoGuan YueXiao, MoYu WeiLong GTS, GTS2, GTS2 M, YAN3, and some others. To use the adjustment tool, loosen the screws, insert the adjustment tool into the core, and then tighten the opposing pair of center pieces until they are even and snug.