in order to prevent anybody inserting a lever between the top of the washboard and the underside of the hatch and gaining access to the boat, I drilled a 22mm dia hole in the hatch immediately above the strong point for clipping onto, then I inserted a length of 20mm stainless steel tube which was long enough to pertrude above the hatch by 75mm and go down through the strong point, then i drilled 2 holes in the tube as tight as possible to the underside of the hatch and fitted a padlock through the holes, which prevents the tube being raised. therefore access to the boat can only be done by unlocking the padlock or cutting through the tube, which i believe will put off most thieves….hope this clarifies what i did….ed holmes STORM DRAGON