Sunny Health & Fitness SF-RB921 - Manual (Page 9)

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STEP 4:
a. Secure Rear stabilizer (20) to Seat rack combine (18) with Bolts (36), Arc
washers (37) and Nuts (38);
b. Connect Hand pulse wire 3 (32) with Hand pulse wire 2 (9) and insert the
pulse wire completely into Seat rack combine (18). Then insert Seat rack
combine (18) into Main frame (1), and secure it with Knob (39).
★NOTE: There are different holes on the Seat rack combine (18) which
can be used for people of different height. You can find the best position
hole for your height. At the farthest point of the pedal’s travel your knee
should still have a slight 15 degree in it.