by bobhenry » Mon Dec 14, 2009 5:26 am
RD If the hatch supports are simply sliding down with the weight. You may be able to modify the bottom block. If the black knob is like most it has a 3/4 round shoulder and if you were to drill a series of holes with a spade bit only a short ways into the bottom block say about 3" apart you could tighten down the knob enough to lock in the appropriate recess hole and no more slide. Temporarily tack on a scrap of 3/8 plywood or scrap 1x to help guide the spare bit to cut correctly. Just a thought Bob
Growing older but not up !