I've seen any number of shelf-pin drilling jigs in woodworking catalogs. Problem is, most are limited with respect to hole sizes and spacing. That's why I like to make my own from scrapwood, hex nuts with a raised thread diameter slightly smaller than my desired hole, and epoxy.After making the base of the jig from scrapwood, as shown, counterbore a hole into the top of the jig deep enough for two stacked nuts, and then epoxy the nuts into the hole. Let the epoxy cure completely and drill through the nut threads, epoxy, and wood with the desired bit size. The jig will help you hand-drill hundreds of holes before the nuts wear out, and when they do, you can cheaply replace them.—Frank Penicka, Mount Pearl, Newfoundland