Much of Doc Ed's work has used carbon-composite arrows simply because they are hollow and thus provide lots of room to experiment, including inserting various weights inside. The only internally footed wood shafts I'm aware of are individual experiments, my own included, involving drilling out two or three inches from the head and inserting lead wire or a nail. I'll bet mmgrode's link will tell you more. I don't recommend drilling wood shafts. Footed shafts are great but darned expensive. Before next fall, there will be some if not several 200grn neighborhood first-rate glue-ons available that also incorporate Ashby's many other recommendations. I think now is the time for patience rather than investment in the Ashby-style broadhead arena. My 2senze, d