I made a ripping tooth. You dont really need bushings as they arent really moving parts. So a solid round block drilled to proper shaft size. Tooth was 3 pieces of 3/8" plate i laminated together. Two plates the same, third 1/2" larger all around. That was middle plate. Used 7018 rods and welded/filled the three plates together.
This basically gave an edge all around and required only moderate grinding. That baby was tough, put tooth on stump- lifted rear of machine and twisted all around,couldnt break it. Cant find the pictures. Every hoe needs a ripper tooth.