Quality issues X-T20 and 18-55
Good to hear this is normal on Fuji (and Canon) systems. Never noticed it on my Nikons or my Olympus cameras. Maybe it's because of the Zoom/focus rings being much more dampened on this lens.
I'll try to make my second point more clear:
Press with you finger on the spot where the serial number is. Maybe just a bit above it. Just feel arround. If you press there the housing of the lens bents inward resulting in a click sound. If there is no hollow space behind this part of the lens, you probably would not be able to press it in.
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