I'm installing the RV-14 style leading edge light kit that Van's sells for the 10 in my RV-10 leading edges. I just got to the step last night where the OP-52 plans say to countersink W-00017 to fit a dimpled .025 skin. I countersunk a few of them before I noticed that the countersink was going all the way through the part very slightly. Have other people countersunk or dimpled these holes? Do I need to put a backer plate behind the holes since the countersink went all the way through or should I not worry about it since it's just a mount for a light?