Soft plastic leeches will work for largemouth bass. You can fish them on a variety of rigs, but some of the more common rigs are a jighead, drop shot rig, shaky head jig and a weightless rig.
Popular Techniques
Hop Them Along the Bottom
Use a jighead or drop shot rig to hop these baits along the bottom with some pauses mixed in.
Popular Fishing Rigs
Drop Shot Rig
The drop shot rig is the best rig for giving a soft plastic leech the most action. You can fish it shallow or deep and have a lot of success with this rig.
Jighead
If you are hopping it along the bottom or vertically jigging it, you have a good chance to catch some largemouth bass. Just make sure to give it plenty of action.