i am ready to have a carpet fitted in the lounge but are fitting new gripper rods to a concrete floor...the previous gripper rods have left little craters in the floor where they have smashed the fixing pins in! + they was pretty loose...i am thinking of plugging & screwing the new rods to the floor with yellow rawlplugs & small screws..so as to get a better more solid fit to the floor thus holding the carpet in place better surely...anything wrong with this carpetfitters cheers