These tubes never had a tab on them, only a drop of solder in the cutout holding the wires on. Yours might be different though as my mag had been worked on previously. Your soldering iron or gun up to full temperature should make quick work of the joint. Just make sure no molten solder gets inside the tube as the brushes don’t have much clearance in there to begin with.
I buffed all of my lams with a wire wheel before painting them while stacked up and it doesn’t seem to have affected the spark in any way.
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