I did have to make adjustments. When dropping in the cover to rail it was to tight and wouldn’t fall in. You really have to push in and down while clamping because of the weight of the cover. Once it was in the rails I loosened them up and made more adjustments again until it was effortless. First time installing oneHow does it close for you? I have the Sentry CT and it takes quite a bit of effort to get it to close. I had issues also during the install of getting the rails to be flat enough to get the cover to roll properly.