2. Install the handlebar set ②: use m5 allen wrench to loosen the screws
at the handlebar, rotate it 180°to adjust the angle of the handlebar,and
then use m5 allen wrench tolock the left and right screws at the handlebar
after adjustment.
3. Install the handlebar set: use m4 allen wrench to take down the 4
screws at the topcover of the handlebar set, fixthe handlebar set,and then
lockthe 4 screws at the handlebar set。
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