The PHILCO Phorum

I'm doing some repair work on this set. It came with no speaker or sound board. Fixed up a pm speaker to replace the original but an at a lose to figure out how the board was affixed to the set. Don't see any screw holes in the cabinet where it was mounted. Was it sandwiched between the cabinet and speaker? Held on by the speaker?
Terry

Mine has 2 speaker screws imbedded in the center bar of the 3 bars that form the grillework. The other two screws are the standard 37 type that go through the face of the radio to secure the speaker.