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Step 4: Slide the upright tube cover (I) down to conceal tube connection. Use Tool6mm Note: Be careful not to pinch the sensor wire connection during assembly. Assembly ASSEMBLY FOR BACK REST SUPPORT TUBE Attach the back rest support tube (P) to the seat support tube (P) and secure using 3 allen screws (N1) and 3 flat washers (N3). 5 ASSEMBLY FOR SEAT SUPPORT FRAME Attach the seat support tube (P1) to the seat slide assembly (A10) and secure it using 4 allen screws (N1). A2PN1J1N8J1-1A10RA3For C