BB-03Choose the right fixing for your wall typeThe fixing you need depends entirely on what's behind the wall covering, and a fold-down bar's pulling action makes this more important than for a static shelf. Into solid brick or block, use a 10mm masonry plug with a screw or coach screw driven at least 50mm into the masonry. Into plasterboard on timber studs, screw straight into the centre of a stud with a wood screw at least 50mm long, adding a noggin if the fixing falls between studs. Into plasterboard on metal studs, a plain screw or plastic plug strips straight through 0.5mm steel, so you need a plywood pattress screwed into the studs with self-drilling metal stud screws - ordinary hollow-wall toggles will pull out over time under a fold-down load. Into dot-and-dab plasterboard, use a fixing long enough to pass through the dab and the 25-40mm air gap and reach the masonry behind, usually 75-90mm total. Into lath and plaster, fix into the timber stud or joist behind the laths, never into the plaster alone, as fixings pull the brittle laths away from the wall.