(one tip: I used a silicone-based double-stick
gel-like "tape" to
remount the implosion protector (with an air gap) because the naked
CRT didn't fit the VT220 housing well enough to make me happy - I'd
approach the VR201 restoration with the same expectation).
As far as I know, the front of an implosion-protected CRT works
like a laminated windscreen (windshield). There are 2 (normal)
glass layers bonded together by the 'goo'. If you've refitted the
outer layer with just fixing tape at the edges, you do not have
any implosion protection. And I certainly would not sit in front
of a CRT like that!
-tony