I am trying to remove my old garbage disposal and replace it with a new one. I was able to take out the disposal but I am not able to unscrew the assembly that is attached to the sink. The assembly is jammed and when I try to unscrew (the locknut) by hitting with a hammer on its side, the whole assembly moves, including to metal part on the top part of the sink. I am looking for suggestions on how to remove it easily. Please note that I do not need the assembly to install the new disposal, so I can break it if that is easier to take the part out.
Please refer to the images attached