Hi there,
Well, he certainly did use a flanger to get "that" sound. If you notice, it swooshes up one time, then down the other time. He definitely used an
MXR Flanger. There's loads of interviews with him saying that.
If you get an MXR Flanger, then apparently you just get the sound straight away with all of the settings set to 12 o'clock.
As for your technique, I can see what you are trying to achieve, but that's gonna take some impeccable control, and at the end of the day, you are making harmonics ring out, and that is not what comes across in the song.
It's just good old healthy chugging on a dropped D with loads of flange chucked in !!!
I woulda thought he has some techie guy who worries about activating and deactivating it when he plays live, so it's not his concern. When you're one of the most influential guitarists in the world, you're not gonna bother with having to stomp on stomp boxes when you're playing live...
Pay someone else to do it !!!
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