Speaker grilles

Barrett K5SSO points out that these speaker covers may be just the trick for your µBITx!

Tim AB0WR used some fine mesh black hardware cloth i.e. screen door wire. He cut a piece out of the hardware cloth that is a little larger than the speaker diameter and run a mounting bolt through from the top of the cabinet, through the hardware cloth, using the speaker to clamp the hardware cloth against the underside of the cabinet.