If your meatballs tend to be tough or dry, perhaps you need to tweak your recipe. Adding an egg, breadcrumbs soaked in milk, or even ice water to the mixture can help prevent dry meatballs. Make sure you don't over mix the meatball mixture which can lead to tough meatballs. Use your hands to gently blend all the ingredients together. A small scoop with a spring-loaded handle works well to make meatballs all the same size.