I am building a bimini for a 1979 J30. I am concerned that the slot required for the back stay, if it is in the up position,is so wide, 16", that the top will not tension properly. Does anyone have any thoughts or experience with this? Can the backstay be tensioned enough to bring the tackle below the top and use a smaller slot? Any thoughts or suggestions will be appreciated. Pictures of an existing bimini would be helpful.