Remove the trackball assembly.If you have a magnetic tip screwdriver you can place the tip on the assembly and it will attract the magnetic rollers.

• 把轨迹球架子弄出来，最好找把带磁铁的螺丝刀（一般都是吧，就是螺丝刀头可以吸东西那种），轨迹球架子会自动贴在螺丝刀上。