My husband and I are going to start raising rabbits to sell and we want to tattoo all of them. We are going to specialize in mini rex. We want our rabbits to be tattooed so you know where they came from and so they can be used in shows. I don't want to use the pen because I don't have good enough hand writing and I know you have to go over it a couple times, where with the clamp, it's done once and over with. What is the best clamp to use for a mini rex?