This is an adaptor bracket to allow you to mount a smaller speaker in a Commodore 1702 monitor, the default is a 4" square speaker (I only had a 3" on hand), I also included my SCAD file so you can adjust it for the specifics of your speaker if needed.
This was tested on an NTSC Commodore 1702 monitor (it may work fine for others as I suspect the cases were the same, e.g. PAL, etc) .. Possibly would work for 1701 monitors as well. (untested)
You can pretty much use whatever material/settings you want.