You can heat up a the tip of a small flathead screwdriver and use it to trim the whiskers away where each fletching passes through. Where the opening is on the new ones, line up one of your fletchings to go through the opening and cut away 2 other openings where the other fletchings will go through. The biscuit will still hold the arrow firmly in place, but give you more fletching clearance and longer life to your fletchings. Especially if you shoot vanes.