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On mine I just use single side sticky foam tape around the perimeter of the LENS not the CRT its about 1/4 wide and about 1/8 thick. Then you just place the lens on the CRT, since its not sticky you can take your time and position it carefully. once you are happy with the position, get some wide packing tape and secure it on the top and bottom where the mask hides the CRT. The foam all around the lens prevents any dust or other garbage from getting between the lens and CRT face. this makes it very easy to remove the lens if ever needed, but I think the main thing is if you get a piece of dust in you can just lift of the lens get it clean and put back on, examine if all good tape and done.
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