HOMCOM A90-259 Assembly & Instruction Manual page 5

Step 2
Attach the Seat(08) to Seat Slider(06), then put it onto Seat Support(03), tighten with a Flat
Washer(18), Spring Washer(19) and Knob(20).
Insert this Seat Support assembly to Main Frame(01), secure by using one Adjustable
Knob(11).
Noted:The Adjustable Knob(11) is pre-assembled,when using it please follow below:
1:Turn knob counter-cloclwise three times.
2:Pull knob outward and adjust seat simultaneously.
3:Push the Knob back inward until it clicks and the tighten it by turning clockw