: I've been thinking of doing this. But, can't you feel the screw
: head through the skin, if you push a bit? Or, is the screw head
: countersunk in the bracket?

If you pushed the skin I am sure you could find them, but I always make sure they are below the skin when I install them. They are above the water line so there is nothing that is going to cause them to contact the skin and rub a hole.