I've taken the plunge and started an RV-12 tail kit. I'm building the vertical stab and have been doing some test dimples in material the same thickness as the skins. I have purchased a #8 dimple die for dimpling the forward stab skin for the countersunk screws as called out in the plans. The hole size is #19. When I dimple with either a c-frame or a squeezer, I noticed the the #19 holes become slightly enlarged so that the screws have a looser fit than the bare non-dimpled #19 holes. I'm trying to determine whether my dimpled holes that are slightly enlarged are unusable and to determine a solution before I dimple the actual skin. Any insight or wisdom is greatly appreciated.