the biggest problem is tightening the plastic nut as some others have said. I replaced my standard bushings with 2 of these and even the bottom profile nut was very difficult to tighten as the edges kept banging against the back of the panel. Eventually I started twisting the front to tighten it while holding the nut on the back. I had no trouble taking them off, but it took me a lot of effort to get them tight enough so they wouldn't rock.
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