An adjustable tower stud assembly is disclosed for securing an object, such as a roof rack, to an external panel such as the roof of a vehicle. The object requires more support than can be provided by the external panel and it is also connected to a sub-surface support. Upper and lower collared studs are connected by a threaded connection that allows the length of the tower stud assembly to be adjusted. Stops on a lower collar ground the tower stud assembly to the sub-surface support after the tower stud assembly is adjusted to the proper length.