Got this at auction. Jacks up with the what I think is a foot operated lever but there is no way of getting it to lower from what I can make out. The saddle where the jack arm fits is not connected to the pump and its return springs are snapped. The handle has a square hole on its lower end and is rotated by the knob on its top. But there is nothing for it to connect to at the actual hyd bit! I think perhaps the hyd unit has been fitted to replace the original but am damned to see how to lower it. There are two plugs on the top one with a allen head and the other a flat blade head. Took the flat blade off but nothing happened and under it is something akin to a carb jet type plug. I have tried completely lowering the foot pedal and standing on the lifting arm but no joy there. Any thoughts? OOPS I have lost the first few photos of the jack so I will retake them tomorrow. It is 45inches long and 16inches across the rear castors.