购买链接可以直接去淘宝或者亚马逊搜索钟表内芯。
钟表内芯尺寸是通用的，都是56mm的长宽，18mm的厚度，螺纹的长度可以选择5.5mm左右的，指针选择短的，防止撞到齿轮。如果买错了指针太长了可以直接用剪刀剪一下。
原模型不用做任何修改，只要把螺丝更换成M3*20或者25的就可以

For purchasing links, you can go directly to Taobao or Amazon to search for watch inner cores.The size of the inner core of the watch is universal, with a length and width of 56mm and a thickness of 18mm. The length of the thread can be about 5.5mm, and the pointer should be short to prevent it from hitting the gear. If you buy the wrong pointer and it is too long, you can just cut it with scissors.There is no need to make any modifications to the original model, just replace the screws with M3*20 or 25 ones.