I cover the air holes while top filling my rockets as well.
Rocket V1 I removed the air screw for more flow. Also, to prevent any weeping from the fill screw on the bottom, remove it and put some cotton in, and then screw it back in.
Rocket V2 I just close the air flow ring and fill from the top.
Rocket V1 I removed the air screw for more flow. Also, to prevent any weeping from the fill screw on the bottom, remove it and put some cotton in, and then screw it back in.
Rocket V2 I just close the air flow ring and fill from the top.