[DonRotolo]

We found (and used) a 1" square bar of bronze which weighs 0.17 pounds per inch. Last year we used about 8 pounds of it, this year about half that.

large copper wire - like 600 MCM - is heavy and relatively inexpensive. We have an 8 inch piece which weighs about half a pound, maybe more. If you know an electrician, maybe she will loan you a few feet - but give it back after the season, or pay the scrap value to them at least.

I hear small pieces of railroad track are heavy...