Thats why i said a 10" lathe to give you a little more room to make sure the ears on the part don't hit anything. You would clamp that part to a faceplate and center it by the bore until it runs true. If boring all the way thru the part it will have to be held off the faceplate either by a fixture (great if you have lots the same) or a spacer ring of some sort. If not the boring tool will hit the faceplate and won't go completly thru your part...Bob
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