Abstract: A balcony blockout insert is sized to engage a preformed blockout hole and includes a plurality of contact foot members that are in connection with respective pivot arms and structured to extend outwardly against the inner surfaces of the blockout hole by rotating a tensioning bolt in a clockwise direction using a tensioning wrench. Each contact foot member includes one or more resilient pads for engaging the unique contour of the sidewalls (e.g. circular, square, etc.) of the blockout hole to form an anchor point for a temporary railing post. The blockout insert includes a receiver boot for engaged receipt of a temporary post. The blockout insert is removed by turning the tensioning bolt in the counter-clockwise direction using the tensioning wrench, which causes the contact foot members to retract inwards and away from the sidewalls of the blockout hole.