These caps are poorly designed. You have to bend down one prong of the plastic in order to make the cap fit into the metal channel. It breaks off when you do this. Then, the only remedy is to use tape to hold the cap in place. Other reviewers of this particular end cap have also commented on this design failure. There is a different version of the cap that probably would work much better. Have not ordered it yet. Avoid this one like the plague.
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