How much grease do you want inside the grease cap? I've always tried to keep the cap full and then install the rubber plug. Last couple years I've had an issue on one side with grease slinging on outside of rim. Fishing partner said I should leave some room in the cap for expansion as the bearing/grease warms up.
So I just replaced grease caps and rubber plugs and need to know how much grease to pump in. BBC experts, what say you?