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7
18
17
17
17
17
15
13
2
2
13
5
5
19
8
19
9
3
1
4
Step 2：
a) Insert right bottom tube (1) and left bottom tube to extension tube (3) and screwed by hex
bolt (15), washer (17) and nut (18)
b) Insert upper upright post (5) to right & left upright posts (2) and fixed by knob (13). Then fix
the right safety hook (8) and left safety hook (9) to the upper upright post (5) and fixed by nut
(19).
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