how do you crack (open) a Rainbow mono monitor?

My problem with all this is that DEC did not make their own CRTs for these terminals/monitors. And even if they were custom-designed (which I doubt), I am amost positive that the envelopes are stanedard. They are the smae dimensions, have lugs in the same places, etc. So it's likely the implosion protection was standard too. I am sure DEC requried integral implosion protection on such CRTs, they would have not complied with safety requirements otherwise. This could eb done through a tension band, a laminated faceplate or probably other methods. Wht is not obvious to me is that if you alter the CRT in some way, such as removign oen layer of a laminated faceplate, that it still remains safe to use. Maybe it does. CRT data sheets/books are no help, they simply say 'No attempt should ever be made to remove the outer glass layer or the tension band' or words to that effect. No CRT manufactuer is goign to state publically it's OK, in case some idiot does somehting silly and gets injured . The liability is too great. An off-the-record comment from somebody who'd worked for a CRT manufactuer [1] would be interesting... [1[ I know you worked for a regunner, but that's not quite hte smae thing. Most regunning involves working on the thin glass at the back end of the neck, not the screen/flare. My worry is what happens if the glass fractures at some point in the future. You might not be the one using the monitor then. -tony