The picture is too grainy, can not see the hinges in detail but on my NEMO (made in Italy) hatches a ten mm Allen key takes care of the tightness of the cover.
I adjusted it two years ago stiff, still good. It should be quite tight not to come down by its own weight.
To be honest, never ever seen a strut on a yacht.
I surpose you could put a small keg in there and run a direct line to the cockpit 
then no strut needed