You can remove the crossover board from the cabinet. Trace the four corners so easier placement later.
I use a 5 gal bucket stirrer stick and a hammer to release the board. Tap gently moving around the outside slowly. Then it will be a snap to work on.
Use a screw and silicone to reattach once finished.
I use a 5 gal bucket stirrer stick and a hammer to release the board. Tap gently moving around the outside slowly. Then it will be a snap to work on.
Use a screw and silicone to reattach once finished.