When i got DQ the hinged lid in the stern deck covering the weedhatch was very stiff and creaked.
Fortunately, unlike the OP, the hinged allowed the lid to be taken off. Judicious use if the lump hammer (through a piece of wood) eventually got the lid off. I then applied Copperslip grease, which made opening the lid effortless and silent.
This however raised an unexpected consequence. When the boat lists in the right (wrong?) direction, the lid slips off its hinges as you open it.
I intend to rectify this by treating the hinge to years of neglect. ?