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Getting the plastic inserts to go through the backside into the soft aluminum surround was trickier than I had anticipated-especially by myself. Another set of hands to just hold the grille is recommended. I found that two sets of locking pliers like these positioned as close as possible to the edge of the insert so the aluminum wouldn't distort. If it does gently tap it squarely with the edge of a large flat blade screwdriver, then insert the screw and carefully tighten.