I must be missing something but my GL jazz arrived yesterday and there is no access to the truss rod. I've had basses where the adjustment was at the top of the neck and one where it was at the bottom of the neck. The Geddy has what lookes like where you would adjust it at the top of the neck but it's not open. Does this bass need the neck removed to adjust? Do I have some weird manufactoring error? Never seen this before.