I have over 60 Do-it brand sinker, jig and decoy weights molds. I have been using Do-it brand for well over 30 years. Unless you go with a custom mold, you beat their quality.
To tag onto this. Any source for reasonably priced molds? I have been looking for a while as I would like to make some pyramid sinkers and some slide sinkers. I do keep my eye on eBay and FB for them.
I started with do it molds and made inline spinner bodies, spinnerbait wires and so on. Next I was making muzzle loader bullets, then center fire pistol and rifle bullets with powder coating. It a sink hole that keep swallowing you.