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Yeah only took 40 thousandths out and featherd back for better flow, did not use a ballend cuz had to do with carbide, hard steel. Well worth doing cannot damage anything.
Been in the machine shop 44 year and knew unless you uses a carbide ball end mill (rather costly) that was all that was going to cut it. We do a lot of grooves in faces and bores for grease type applications. Nothing bathed in oil. Still not sure what you are trying to do. Have you seen wear on this face. You may be better off blueing the drive dogs and with out the belville springs to see were they hit the three spokes. The polish that area. The part is only case harden, probably less the .020-.030 thousands so you would only want to take off a few .001
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