On the gas lift component itself there should be a small cap on the top, before assembling it, please remove the cap and this will ensure it functions correctly.

Delivered to your doorstep. Overall Dimension: 59.5 x 60.0 x 104.0cm. Forever-stylish faux leather upholstery; Thick padding for comfort, with high back and armrests for support; 360 degree swivel seat works with your body as it moves; 94-104 cm adjustable height: set it to a level you want; Maximum load 150kg, assembly required; Overall Dimension: W59.5 x D60 x H(94-104) cm; Seat Dimension: W48 x D47 x H(40-50) cm; Pad Material: Faux Leather + Sponge; Colour: Black; Supporting Weight: 150kg; Item Label: 5550-3478BK;