I just completely tore down the engine on my '72 cl350. It's in decent shape, and low mileage, but is badly oxidized and dirty. Decided to have the cases vapor blasted. New seals and gaskets. New rings and maybe a valve job. My only problem is with the oil baffle in the bottom case. I took the two screws out of it, but the others look like rivets. Does the baffle come out? Thanks.