We changed the design of limit switch, from spring to Rocker, put inside the post. It looks better and much safer. Lift Comparation Hongtech liftAdvantages/Dis-advantagesTwo post Lift Lifting Capacity4500kg4000kgPlease look at below in red word, width of post material, there is no way to lift 4500kg with 5mm thick steel, the one gives your spec are not telling you the truth. If you put a 4500kg ...