Made up a 20 ml batch of sealant. The pocket scale is perfect and obtained through e-Bay, as were the medical disposable 50ml syringes.
* OB/IB solid Rivet heads * Fitted access plate/cork gasket and screwed/sealed (Permatex Form-A-Gasket # 3 - Aviation - this is also suitable for sealing AN fittings as it is a liquid brush on and suitable for all types of aviation fuel)