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Five Lug Conversion Welded Hole

3b. Next, we TIG-welded the holes, starting at the bottom of the hole and working out way upward, until the weld was above the flat surface of the part (3a-3b). The heat generated by this procedure is excessive, and it will warp the part, so be prepared to re-machine the face of not only the hubs but the rotors, as well, to make them flat again.
Five Lug Bolt Pattern Conversion - Hole Exchange

3b. Next, we TIG-welded the holes, starting at the bottom of the hole and working out way upward, until the weld was above the flat surface of the part (3a-3b). The heat generated by this procedure is excessive, and it will warp the part, so be prepared to re-machine the face of not only the hubs but the rotors, as well, to make them flat again.  View Related Article