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I finished the mods to mount the glass CRT (21FJP22) today. Steve McVoy provided a complete set of mounting hardware from a junker CTC-7 (intended for the 21CYP22, which has the same shape as the 21FJP22, but a different anode connection location).
Thanks, Steve!
It turns out that this hardware fits the CRT perfectly, but is exactly wrong for the CTC-5 bezel. For example, the CRT rim insulator is corrugated just enough to prevent it fitting in the CRT well molded into the bezel. Also, the metal shield, while it looks similar to the shield in the RCA adapter kit, is actually just the same size as the CRT well, so doesn't fit either inside or outside. Since the manual says it's not used in metal cabinet sets, I know it's only purpose is magnetic and not structural. Therefore, I did the CRT mounting without it, and will cut it as required to mount it over the other hardware.
Despite the mismatch to the bezel, it was possible to use the mounting ring by extending the bolts that are built into the CTC-5 bezel. This saved me from what would have been a difficult construction for me. After I extended the bolts, I called a friend to see what I had done (before standing the set up), and he suggested that the bolts would probably bend and let the CRT shift if not supported. Fortunately, I had bought one of each kind of padding material offered by American Science and Surplus, just in case I needed it, and the foam rolls you see did the trick.
The anode button is a bit close to the mounting ring, but I plan to use silicone grease and also to put the smaller rubber insulator from the CTC-7 between the HV cup and the ring.
Now, I have to find and fix whatever burned the B+ dropping resistor for the tuner, and work towards pictures!
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