Man KF-OB Owner's Manual page 9

Assembly
NOTE: Hand tighten bolts and nylon nuts until machine is fully assembled.
B
B
STEP 4
CARRIAGE ASSEMBlY (B): Connect Seat Support (10) to Carriage
(8) with Bolt (29), Washers (37) and Nylon Nut (35).
Connect Back Pad Support (9) to Carriage (8) with Bolt (29), Washers
(37) and Nylon Nut (35).