9.Pull out the Seat Knob (45) as far as it will go, and set the Seat Carriage (12) on the Bench Rail (5).
Loosely attach two 8mm Metal Spacers (42), a 60mm Metal Spacer (39), and two Bearing Wheels (46) to the center holes in the Seat Carriage (12) with two M8 Flange Nuts (19) and the M8 x 114mm Axle (57). Make sure that the serrated edge of the Flange Nuts are against the Seat Carriage.
While a second person presses down on the Seat (13), hold the wheel assembly firmly against the bottom of the Bench Rail (5) and properly tighten the M8 Flange Nuts (19). Make sure that three threads are extending past the Nut, and that the wide sides of all six Wheels (46) are pressed against the Bench Rail.
Engage the Seat Knob (45) into an adjustment hole in the Bench Rail (5).
10.Press two 25mm Square Inner Caps (54) into the indicated end of the Backrest Frame (15).
Attach a Plastic Foot (53) to the Backrest Frame (15) with an M4 x 16mm Screw (62).
Attach the two Guard Plates (17) to the inside of the Backrest Frame (15) with four M4 x 16mm Screws (62).
11.Orient the Backrest (14) and the Backrest Backing (8) as shown. Attach the Backrest and the Backrest Backing to the Backrest Frame (15) with four 1/4” x 45mm Button Head Screws (58).
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8