If you're looking to turn a barbless hook into a barbed one, there are a few different methods you can use. The most common is to simply bend the barb back with a pair of pliers. This will work for most types of hooks, but isn't always the most reliable method. Another option is to use a sharp knife or file to carefully grind down the barb. This takes more time and effort, but will result in a sharper and more durable point.