No, there's definitely nothing defective about it - it's a deliberate design/manufacturing choice. Many of the cheap versions don't have the bell mouth design, and instead there's an angled section rather than a smoothly radiused bell mouth. Unless you are specifically looking out for it, you may not notice - and I'm perhaps just a tad obsessive about details like this
I think it all depends who the supplier is though. Mine wasn't a Kyostar.
I'd be interested to see a photo of the inside of the Kyostar once it arrives to see how it compares with the cheap model I bought:
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Good tips regarding the installation too - like you, I also found it pretty straight-forward. I might try the superglue tip too - nice one!
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