There is nothing wrong with ballasting in a bucket. The reason I ask is if he is testing the action of his bait in a small space, like a bathtub, he will never know how it actually swims. It takes a bit of space to test the action, especially on a glide bait. You can get away with a small space on some 3+ piece swimbaits but you aren't going to get away with a small space on a 2 piece glide. Hope this helps.