Thanks all for your input! My slide does drop down to hold the doors shut.. I cut off the 'D' handles (shown)......
.......and replaced them with this beautiful brass adornment, but that's only any good getting in the boat.
I have a gadget, a length of 3 x 1 with wheels on, that I can use on the inside to lift the hatch and draw it back the first foot but its still difficult to open and close from the inside.
My current method is to lift the slide with my head, but this is not much good for my neck. I am sure I am shorter now than when I first got on the boat 15years ago.
Aluminum or Dural would seem to be a solution as I reckon it would reduce the weight by more than half.
I had also thought a nice Sapele construction would look good but am concerned about security.
It really is the lifting bit that is the problem, but even though I wax the runners it can often be hard to slide.