Tried something that worked really well on my U-boat. 5# Kettle weight from your favorite exercise equipment store. Large, hand-grip loop that's easy to loop your anchor line through. Vinyl coated and no sharp edges to poke holes. Handle doesn't let it roll around. Cost should be about $2.50 per pond and they have 5 and 10 pound models. Some sort of trolley system would have been nice to keep me pointed the right way, but that I'll have to do on my kayak. The float tube is being retired. Not mobile, or fast, enough.