Step 4Mounting the USB screen
The easiest way to do this is to sit the CRT on top of the screen and mark the holes from the metal frame, once you have these holes you can cut a rough rectangle out around the holes.
Work out the centre of the screen by measuring from the four holes (a simple cross by joining up the screw holes works.)
Once you have the centre you can then mark out a rectangle for the usb screen to sit into. Measure the outside of the USB screen to get these dimensions.
The screen will look more aesthetically placed if you place it slightly above centre, this is just do do with how the human eye works.
Once you have your frame cut out check the fit on the frame, you may need to cut away in a few places to make it fit flush.
You can then build up as many layers as you wish, I settled on two layers of 3mm styrene.
Use a couple of strips of webbing material to hold the screen in place, be sure to seal the ends using a lighter.
The entire frame screws into the casing using the original screw and holes. No modification to the original Mac.
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