Ok I have 12.0" Ø round stock 4140 with a 4.0" bore and about .5" deep there needs to be a 8.0" Ø ID groove 1.5" width. I looked into custom groove tools and nothing is ridged enough to handle a 2.0 projection unless its to wide then it wants to grab nothing seems to be working I can mill or turn this application. HELP TIA

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