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Make sure that the mounting for the face of the crt is very secure. Usually this will be some sort of metal or cloth strap wrapped around the perimeter. Every one I've seen with this type of mounting was okay, but you need to be sure. You will want to be very careful while leaning it over, especially the first time. Sometimes they are "naturally balanced" and will just rest there on their side, but other times they are more awkward and you will need cushioning of some sort to shim them in place while you work. On sets where they crt is not attached to the chassis, well, that is another thing entirely. I don't like doing that unless absolutely neccesary.
The crt brightener plugs in between the crt socket and the crt plug. The circuitry is contained in a little cardboard tube. Basically just a small transformer in there that raises the filament voltage. They can hasten the demise of a crt, but if it is on the way out anyway it will buy you some additional time. Used/NOS brighteners are not hard to find. I can probably come up with a spare.
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Bryan
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