KC-05Fix a temporary support batten along your lineScrew a straight timber batten (about 25mm x 50mm) along your level line to carry the weight of the cupboards while you fix and align them. The right fixing depends entirely on your wall. Into timber studs: use a 5mm x 60mm wood screw driven into the centre of each stud you marked. Into metal studs: never use a wood screw or plastic wall plug, both strip straight through 0.5mm steel — use self-drilling metal-stud screws, and if the cupboards are fully loaded with crockery, fit a timber noggin between the studs first or fix through to solid masonry behind, since a metal stud alone will not reliably hold that much weight pulling outward. Into dot-and-dab plasterboard: use fixings long enough to pass through the plasterboard and the adhesive dabs and bite at least 30mm into the masonry behind, typically 75-90mm long — plasterboard toggles alone are not strong enough for loaded kitchen cupboards. Into solid brick or block: drill an 8mm hole 55-60mm deep, insert a matching wall plug, and drive in a 6mm x 65mm screw. Into lath and plaster: locate a solid timber stud or noggin behind the laths, since the laths themselves will not hold any weight, and fix a wood screw into that timber; if there's no timber where you need one, fit a noggin first.