That step completly depends on how the plastic off your camer has broken. So you might wanna redo things.

Take your shears and cut a small stipe of aluminium. Make it longer than you'll need it, so you can hold it, while working on it. THe width is given by the width of that broken plastic thing (ca. 3mm)

Bend the aluminium and make a hole with your powerdrill on the blue marked spot in the second picture.