I bought a C6 a few weeks ago. When you put the front wheel on the bike and put the axle rod through the centre of the weel, there are two springs on the rod. One goes one one side of the hub and the other on the otherside with the lock nut. Looking on your video you have two of the springs on one side.
![[Review] DYU C6 จักรยานไฟฟ้ารุ่นใหม่ล่าสุด ดีไซน์สุดมินิมอล ฟีเจอร์ครบจบในคันเดียว](/img/n.gif)
I bought a C6 a few weeks ago. When you put the front wheel on the bike and put the axle rod through the centre of the weel, there are two springs on the rod. One goes one one side of the hub and the other on the otherside with the lock nut. Looking on your video you have two of the springs on one side.