Anyone have one? I bought one last december and it has become defective. The damaged part is the turn dial to lower the jack,which has a spring inside the housing that has buckled. I been in contact with the company and they have mentioned that it only requires a quarter of a turn to lower the jack. Meaning that I have been turning it more....hmmm. I have known it in the past to be very difficult to turn due to the spring strength. Has anyone got the same type?