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Slotted Desktop Seam Joining Plate
A ribbed plate, 160 x 70 x 11 mm, that screws to the underside of two desktops butted together (for an L-desk, a bench extension, or a split top) and keeps them flush. It has eight 5.0 mm slots, 14 mm long, for #8 (4.2 mm) wood screws with washers. The slots let you pull the tops tight before you snug the screws down. A V-notch marks the centre line so you can line it up on the seam. Three 7 mm tall ribs run across the seam to resist sag.
2020 Octagon 135° Joining Plate
A 6 mm flat joining plate that holds two 2020 extrusions at 135° to each other, the corner angle of an octagon frame or an angled chassis base. Each 20 mm wide arm has a 5.6 mm alignment key that drops into the 6 mm T-slot and two 5.5 mm clearance holes at 20 and 45 mm for M5 T-nuts, so mitered beam ends line up square to the plate without any fiddling.