The Zenith method is pretty tame and reliable. I've done it perfectly all three times attempted...In contrast 2 of three RCA operations ended in destruction of the CRT for me (the most recent was last weekend
). The middle one a few years ago I got lucky and only ruined the safety glass and put a small nick on the face of the CRT chipping the rest of the glass off. I think I'm at the point where if I did another RCA I could be successful with it....I get better every time, and the last one would have been the best yet had the screen not cracked at the cusp of getting the last of the glass free.