Those listed finese drop shot molds are TINY 1/8 to 3/8ths of an ounce. And they don't have mulituple size weights cavities in each mold. So you would need to buy a bunch of different ones for your task.

http://do-itmolds.com/shop/index.php?route=product/category&path=1_10_73

The doit mold to pour pencil lead could be modified from a 1 eyelet to a #7 rosco crane swivel with a dremel.

I think the Lil Mac pencil lead mold would be your best bet, for a mold to modify to use a crane swivel with.
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