You need to acquire from the nearest dealer or the B&W service center the rod that screws into the center of the midrange driver once the bullet is removed. Step one , remove grill and center bullet. Step two, screw rod into center of midrange driver, hand tight is fine, Step three, acquire a friend to help. Step four, have the assistant hold the rod from the front of speaker such that it will remain stable as you unscrew the screw from the back of the marlin head. The transport screw. The assistant needs to have a stable hand as there is a jel substance that interfaces between the driver and the marlin head that you want to keep undisturbed. Once the screw is removed from the rear, the driver will be free with the exception of the connecting wires. Unclip wires and pull foward. A few things to note. The screw is a soft material and will probably be marred up with a screwdriver. The rubber washer that surrounds the screw in the rear is good for one application. You may want to order a screw and washer when ordering the long rod. The procedure is not difficult btu requires care and patients.