I bought these for a sil-nylon tarp that I have that has no side pull-outs. Looking at the pull-out, I see that the little clip retainers that hold the donut have sharp edges, and that worries me a bit. These have been out for a while, and I am wondering what others' experience has been with them? Are they tough on a tarp? Should they be left on, once installed, or removed and reinstalled with each use?
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