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Looking at the RCA field service guide, I see there are diagrams of the CRT mounting for the 21CYP22 with it being held in place by the magnetic shield. However, although it mentions padding, it doesn't give any details, because in replacing the tube you would just use what was there from the factory. So, I know some more, but I'm still left scratching my head on how much and what kind of padding and where to put it.
The CTC-11, which is the first using the 21FJP22, has similar mounting, but padding is not even mentioned. CTC-12 and later use a mounting strap and special brackets that grip the edge of the screen. I don't think there's any way I could safely duplicate that.
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