For some time I have wondered if you could get a 1mm sheet of Perspex cut to the same size as the rear of the backglass.
Would cost about $40.00
Then place the Perspex sheet over the rear of the BG, mark out the score and credit rectangle area’s.
Remove the Perspex, cut out the score/ credit areas
Put Perspex back onto the rear of the BG.
Then ( and this is the unknown part ) use a high quality tape to ‘tape it’ fully around the edges to the glass.
To try and explain this properly I am only talking about using a strip of tape say around 10 or 12 mm in width, that would run down the edge length of the 2 surfaces and then JUST fold around onto the FRONT of the backglass and the REAR of the Perspex, enabling the Perspex to remain in place pressing against the rear of the backglass and holding it all in place. The visible strip of tape at the front of the backglass ( probably about 3-5mm ) would then be hidden in the channels in the backbox when the whole BG is placed back into the machine. NO TAPE would be touching the rear of the original backglass.
However - I have no idea if the Perspex would bow in the middle or be affected by the heat of the globes in any way.
Yet to try this .
Anyone’s thoughts?
Original - I'll give you that !
But I would seal the backglass and prevent further deterioration.
