I'm creating a template to created 1/4 inch holes for adjustable shelves on some bookcases that I'm building. I use a plunge router and am planning to use a 1/2" guide in 1/2 holes in the template w/a 1/4" spiral bit for the shelf guides. I'm planning to make the template from 3/4 plywood and in such a way that I can line up the bottom with the dados in the side of the case, clamp and drill w/ the router. Anyone have any other suggestions to avoid disaster????