(3)As shown in the figure, first connect the induction line at the main frame tube with
the induction line at the armrest tube, and insert the handlebar slide rail tube into the
front cover, insert it into head tube of the frame. Align the holes and insert the washer
and the screw (flat washer for the flat surface, and the arc-shaped flat washer for the arc
surface). Tighten and fix them with a wrench. Finally, click down into the front cover.
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