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Yeah, the 21fj's were frosted. It was supposed to reduce glare. To me, it's like watching tv through a frosted bathroom window. If it didn't originally have the bonded glass, I would get rid of it. If you just take the glass off you have a 21fb. What sort of tube and safety glass was in it originally?
The original goo is called PVA. I hear it's tough (read impossible) to get all the bubbles out. Makes you wonder how the factory did it.
I've heard some rebuilders used to use a ring of double-stick tape to space the glass out (air in-between tube and glass) an then sealed the edge with tape like original.
I think most people use silicone like Big Dave did. Frenchy posted some pics a while back of this, too. As I recall he used some sticks to space the glass away from the tube while the first silicone dried.
John
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