Click here to download Laserlite® PDF Click here to download Laserlite® Installation Hints PDF Enquire About Laserlite® Now Stage 1 Firmly place the sharp point of the One Shot® fixing onto the crest of the corrugation to be fixed to eliminate “skidding” or “wandering”. Stage 2 Start drilling at 1000-2000rpm to pierce the sheet. Screw engages in timber purlin. Stage 3 Cutter engages polycarbonate sheet, cuts the expansion hole and centres the screw. Stage 4 Cutter engages the purlin and provides resistance to indicate that drilling should stop.