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Happens to everybody. If you do a search you will find tons of complaints about it. I found that if you tighten it the best you can and leave it, then keep tightening it every so often it will eventually come pretty close. Check it next week and you can probably tighten it a little more.
Worked for mine, just kept working it until it closed. However, this was accomplished during installation. It did seem impossible when I first tried to put it on.