Purchased a pair of RV10 Billet Trim Brackets and two cover plates they attach to. I understand that some builders have attached them using screws and nuts. Wondering what size screws and nuts they used and info on countersinking the billets to accept the dimple for the screw. Or did they just use a round head screw? I like the idea of this type of attachment over the blind rivets in case I have to remove later. Thanks