5.9 Magnum flywheel - DIY with bolt-on weight??

Idaho. I'm going to be modifying a neutral balance flywheel for use on a LA 360. I will start a new thread when I do it, but I think I can offer you an answer as to why your weight numbers were out, 18.13 in oz instead of 12.825 in oz. I think you will find that the more you spread the removal or adding of weight around the circumference of the flywheel the more you will need to remove or add, because you are moving away from the sweet spot of 41 degrees. If those 3 large holes were closer together then I think you would find that they would be smaller and shallower.