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I usually just give the neck a good sideways whack, never had a problem but I suppose there's always that one n a million chance something will go wrong.
I don't like the punch on the anode methode, like Charles said, it better be sharp or you will be putting a lot of stress in the worst possible place, a drill would be safer I think.
A drill through the end of the base cap is pretty good too, it just breaks the evacuation nipple and that is much thinner glass than anyplace else.
That's what i do with the 7JP4's because there's no anode and no real neck to speak of, it's the only safe place to puncture those tubes.
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