Does anyone use 4" ringworm's? And how do you use them?

Yup. Northland Slurpies 4" ringworms in "Green Sunfish" are my go-to lure.

T-rigged on a 2/0 offset round bend or O'Shaughnessy hook with a 1/8 oz tungsten bullet weight.

It has worked on every body of water I've fished in the past few years.

Yup X2, Luck E Strike and Berkley. Mostly on a 1/8 - 3/16 Spider Slider Head.

One of my confidence baits!!  I fish them on a Texas rig with a 2/0 hook and 1/8oz weight.  I prefer Lucky Strike or Yum.

I like to fish this behind a 3/16 oz sinker on a Mojo rig, I've been using the Zoom but my favorite is the discontinued Powerbait version. This rig will put a lot of numbers in the boat.

Berkley discontinued the two best baits they made, the 4" finesse worm and the ringworm. Basically fished them both the same way. Now I use mostly Luck E Strike abd custom pours. I still have a few Power Worm bags though.