I'm reassembling my 1972 Thermoquad and I'm not sure where the aprox. 3/8" Diameter OD and 1/4" Diameter ID cork gasket that came in the rebuild kit goes. I do have one sitting on the bench that I took off so I know it's needed but can't remember where it came off from. This is NOT the black rubber orings that go in the plastic body, I do have those and know where they go. Anybody know where this one cork gasket goes? Thanks