Hi folks , what im after are hinges to replace the kind of gas filled hinges that you sometimes see on car boots . At work we have wooden hatches which need to have self closing hinges on, due to lazy people who would not otherwise close the hatch & so creating a dangerous environment. At present we use the gas filled arms but these are a real pain to fit & i wondered if there was anything out there which would be easier, i saw some soft closers on jacksons fencing website but without seeing these i dont know if they would be any good.By the way the hatches are made of 19mm or 25mm ply & are about 2 feet square , any help would be appreciated , thanks Tony