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Sink Plug Parking Peg With Chain Notch
A wall-screwed peg that holds a loose sink or bath plug off the basin. The 25 mm peg with its 18 mm up-turned lip holds the plug, and a 3 mm notch in the lip catches the bead chain. The 30 x 75 mm plate takes two 4.5 mm countersunk holes for #6/#8 wood screws or M4, and a 45° rib under the peg carries the load across the layers.
Print-In-Place Shade Chain Loop Tensioner
This print-in-place tensioner for roller and cellular shades has a 40 mm V-groove pulley (8 mm wide, 4 mm deep). The pulley turns on a 9 mm pin and is held in place by an overhead bridge, with 0.5 mm clearance on every mating face. Two #6 screws (4.5 mm holes) hold it to the frame: one goes through the hollow pin and one through the tab. It keeps a loose bead-chain or cord loop (up to about 5 mm) taut and close to the wall, so a worn clutch is less likely to let the shade droop and children can't pull the loop out.