If you want to get just one mold to make the 1/16 and 1/32 ball heads you can look at the Ball head Model JNR-8-1632 it makes 4 of each size.You can buy them from do it,barlows,or many other places.
Do-It Round Head Jig Molds
Do-It Molds: Jig, sinker & lure molds for pouring your own lead fishing tackle