Remove the 2 screws under the handle, then the 4 screws below that securing the pump in place. (Sealer a bit messy). Remove the pump assembly complete. One of the clips at the bottom will have snapped causing gap and lack of pressure. File away the remainder of the broken clip. Fix a nylon tie fiirmly round the botttm of the tube, then put another tie around that, over where the broken clip was, thus holding the whole thing together.
I've just done it, and the pump unit is firmer than its ever been.
The local dealer wanted £25 for new pump assembly. All it cost me was 2 plastic ties !!!
Ian
August 2010