Very difficult to install! I would use a different butterfly. The problem is that you have to be very slow and careful when screwing in the screw, otherwise the part holding the wall may pop out. Depending on what you're attaching, this may not be an issue as long as you have enough bolt length to snag on the inner tube. I was attaching a thick piece of wood and needed the full length of the screw, so it turned into a multi-hour project trying to screw it in. Also, there was no easy way to get it off the wall. Others you can just cut and the price will go down and you can fill the hole.
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