Step 3:
25
26
27
29
30
39
40
20
a.
Insert saddle post(25) into mainframe(40), lock it with knob(39)
after adjust it to suitable position.
b.
Lock the horizontal saddle tube(29) on saddle post(25) with washer
(27) and knob(26).
c.Lock the saddle(30) on the horizontal saddle tube(29).