i just installed my sun shade (at last), i didnt use a drill or any wood...i took all this out though
pushed the base of it in to the lining of the roof to make the indents for the holes and it slipped in through the fabric, so i made a little hole with the screw it came with, pished the shade in and put the screw in, it tapped in to the backing bored of the fabric, DONE took 2 mins if that and it seems fine, odd though as it was asif the little holes for the prong bits had been in the car already... any ways its in and i like it alot, another little "OEM"mod to the collection