YOTRIO 68840815 Instructions De Montage page 5

Place the SEAT(C) laterally on a flat, protected surface. Connect FOREFOOT (D) to
SEAT (C) with 2*BOLT(ST4.8*12) (H).One is tightening.
3
Tighten all bolts with CROSS SLOTTED BOLT WRENCH (M).Don't overtighten.
Excessive tightening may cause peeling and cleaning of bolts.