These baseball caps are made of strong, rigid plastic that won't flex at all. I have strong hands and couldn't get them in or out without a large pair of pliers. My bumper is a standard size so that's not a problem. But I found a solution. A "V" is cut in the two corners to be folded, but it only extends halfway down the cap. I cut out this "V" so it goes all the way up now. Now I can install them manually. They work great as long as you can put them in and take them out. Hopefully Camco sees this and other similar bad reviews and makes changes.
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