I just make them for myself. I like the way the herring head looks better than the pony head jigs and an 1/8 oz in either mold is about the same size profile. I like the way the herring head has a flat back to it so the plastic fits up to it a little better. For what I'm going to make yes I'm just going to make my own wires I used .31 wire, and at $10.35 for 95 feet I'm not to worried about the cost. I used about 2" of wire per form so I can make 570 forms. It wasn't to hard to make them. If I was making them to sell I most likely wouldn't do this but it's just for myself and my style of fishing.
I tried 1 yesterday with a 3.5" swim shad and have 2 walleyes in the fridge for supper that liked them, so I'm happy with the underspin so far

. Ya they probably would have eaten a regular jig just fine haha, but some times I just like to use something different.