Here is one that I just put in the lake.... it had half a sack of Sack-Crete and sank with no problem....I also tie a 1 or 1 1/2 gal jug on the middle stalk close to the top to asure it stays upright.... even if some jig fisherman hangs and pulls it over a little it should come back upright when the jig comes loose.....
Let me know how it goes..... crappie love'em....
Good fishing...........