I have noticed that although most ball heads have the ability to pan, they have no spirit levels to ensure that the ball head base is level. Few brands have the leveller which replaces the center column and has a handle sticking out from the bottom. Manfrotto and another brand (cannot remember the name) seem to be the few companies which produce leveller which can be used on all tripods (438 leveller comes to mind).
Therefore I am wondering how you guys take panoramic shots with tripods without a leveller? I do have the Manfrotto 438 leveller but it is huge and heavy and does not go well with the Feisol 3442 tripod I intend to get. Any suggestions on how to ensure ball head base is level without a bulky leveller?