7. Attach oriented hook (13) and zinc bushing(34)、separate ring(35) to seat tube (3) with bolt
(M10x90mm)(15), washer (26), flat washer (31) and locknut (23). Attach rubber cushion (56) to
the back of leg-kicking frame (39).
Connect seat tube (3) and leg-kicking frame (39) with powder metallurgy bushing (70), bolt
(M12x80mm)(18), washers (27) and locknut (24). Attach leg-extension connecting cover (37) to
leg-kicking frame (39) with powder metallurgy bushing (70), bolt (M12x70mm)(16), washers
(27) and locknut (24). Slide tube (79) through the leg-extension connecting cover (37), slide the
bolsters (61) onto both end of the tube, block with leg-kicking sofa hole covers (52) and plastic
briquetting (53).
Attach backrest adjusting bushing (18) to backrest tube (5) with bolt (M10x70mm)(12), washers
(26) and locknut (23). Connect narrow single pulley fork (12), pulley (73B) and pulley limiting
board (17) with bolt (M10x55mm) (10), washers (26) and locknut (23).