The crown is a several piece marvel of engineering.
The base of the crown is a socket, and the top of the stem is a nut. When the spring loaded crown is released from the threads, it needs to not only "pop-up" to be used, but it needs to engage the flats of the nut on the stem end.
When you are turning it a bit, you are aligning the nut and socket, which, when aligned, allows the spring to pop it up.
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