I was a bit concerned when people said this thing would break. I found the key is that you don't have to "hook" it when tightening the caps on my Class A diesel. You pop the cap and wiggle up/down/sideways a bit and the cap pops off immediately. If you press too hard, the cover will stick together. The rivet hinge is cheap and might be a future point of failure, but the device itself worked well and the rubber caps hold like glue with moderate pressure.