Sirius Satellite Radio Ursa Major Product Introduction page 8

Step 4: 取下左右手各自的螺丝 X6（沉头内六角 M2*5/M2*6）
Remove the screws X6 (countersunk hexagonal socket M2 * 5/M2 * 6)
on both left and right side.
Step 5: 得到内胆后，拆除卡扣件，准备进行组装。
After obtaining the core, remove the fasteners and prepare for further
assembly work.