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If it was easy it wouldn't be legal. Mags must be permanently limited to 5 rds. So yeah, you gotta drill it out and put in a new pop rivit.
Lanced mags can't be taken apart at all without destroying the mag.
I have a couple of mags were it was the follower itself that was modified, has a piece of plastic epoxied to the follower, kinda like some of the Norinco M14 mags, then a pop rivet in the existing hole of the floorplate just to be extra anal. Keeps the mag original looking at least.