Make sure the structural opening is at least 5mm larger than the panel size, back of frame size. E.G a 600x600mm panel size requires a 605x605mmhole size. You don’t need to remove the door, just open the panel using the budget lock key provided, place the panel into the aperture. Tighten the FlipFix device via the fixing screw behind the door leaf to clamp on the back of the plasterboard (The FlipFix device covers boards from 8mm to32mm) Check the frame is square by measuring corner to corner. Lock the door in place; the door and frame should be flush. Sit back and relax, you’ve just saved yourself 20 minutes.