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The Zenith style cataracts (green halo) are easy to fix. With the tube removed from the cabinet laying face up peel the tape off the edge, then take a number 18 steel guitar string* and securely affix each end to it's own wood handle. Hold the wire tight with a handle on each hand and press it firmly into the glue while sliding the wire along the glue to saw through. I typically start at a corner, and get the wire in along one side of the rectangle and cut towards the other side (instead of going top of screen to bottom). The glue sawing usually takes less than 10min once you get a feel for it. Once the wire is running down a side it typically has a LOT of resistance so I pull one handle with both hands till the other handle has an 1-3" of wire separating it from the glass then, I switch to pulling that handle and repeat. The tube doesn't have to be warmer than room temperature for this...I've done this on tubes in 45 degree weather at night and had it go well.
Once the glass is off peel the glue by hand (use an old credit card if it's stubborn) and clean residue with Goof Off then glass cleaner, then use 1/4" foam double stick tape spacers in the middle of the 4 sides of the screen and caulk the safety glass back on. Don't caulk more than 1/4" in from the edge of it may be visible in the cabinet, and let it dry the full 24 hours before reinstalling or putting weight on the safety glass.
Before you caulk make sure the CRT face and safety glass are spotless cause you don't want to have to open it to clean it once it's caulked.
*I've been using smooth guitar string but some folks have suggested using the bumpy stuff might improve the sawing action...I worry the bumpy wire may scratch the glass and or make the handles too hard to pull (they are enough of a work out with smooth wire). I haven't tried the bumpy wire or heard of anyone using it so I can't say if it changes anything in practice.
If you come over here when the weather gets above 50 degrees I'd be happy to do the cataract removal for you.
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