It is not entirely clear what prevents manufacturers from ensuring that there is some type of rigid ring at the end of the covers, or a very rigid seam, such that the tip of the umbrella cannot pass all the way through to the middle of the umbrella. This has been completed in the past. In general, an umbrella is like an umbrella. The problem of having a hole in the umbrella's tip led to the decision to simply make the seam more robust and substantial.
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