When file down the overhang, where the screws will be,,,the installer didnt think that there is a lot of material left between the screw and the inner edge, and he was afraid of cracking or the material just breaking,,,,It seems to be very hard, so maybe brittle as well? Maybe I should take a chance with the screws, and then if not,,maybe glue...If the sub works well with the enclosure, i dont see why I would remove the sub unless something goes wrong.
There is a no return policy for these enclosures, and they already drilled and placed the connectors in the back...maybe i will have them chance it with the screws..!