Created a new cover plate for the flop tube entry to the fuel tank.

Since I'm not going to be getting this plane cleared for aerobatics, (it's over 50 years old after all) and I'm simplifying the fuel system. This means I'm going to eliminate the flop tube in the fuel tank and go with a simple fuel pick up from the bottom of the tank. Eliminating the flop tube means I needed to create a cover plate where the flop tube used to enter the tank. I'll have to source some fuel resistant gasket material for this.