AHAA....there's a forehead slapper !! I didn't know there was such a thing as coated shot for scuba ballast. Thanks, I'll check that out.
The thing about shot is that you just mix it with a slurry of resin or even plaster ( sealed with a layer of 6 oz. glass cloth), pour into a model airplane wheel pant mold ( got aplenty of them) and you're in business. Assuming there are no conflicting class rule, of course.
