You sure that BBA isn't threaded? See if it unscrews. Also is it possible that it's connected to or part of the upper tube assembly? I'd definitely take out the top set screws before whacking it too much. Maybe take those out then stick a dowel down the barrel and tap it a bit to see what all moves.
Note: While I would love to take credit for his work, I am not associated with Mad Customs!
Originally Posted by senghing27
You can contact BigMatt-MadCustoms in his MCB forum