We had our Fujitsu fi-5750c serviced and the tech did an upgrade to the latching mechanism on the top camera hatch. When we first purchased the scanner, there were two metal dowels that the latching arms would slide over to lock the top hatch down. Over time, the latching arms would cut a groove into the dowels. Fujitsu upgraded the dowels so that they roll requiring less effort to close the hatch. Because the dowels are not stationary, wearing a notch into the dowel will be eliminated.
Great harware improvement Fujitsu!