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I don't take chances with some frags, especially SPS if they have started to lay a footing down. That can takes weeks to months to happen. I just let the frag overgrow the plug, then anchor the plug to a bigger rock and so on.
A duncan? It's just glued to the plug. It won't encrust on it, so I would get a screwdriver and pry it off, taking care to not damage the flesh. Piece of cake.
Popped off with ease!! Anything encrusting would be a little more difficult but this guy just popped out like they just fragged it before shipping it. Bam....done. Thanks!