Thank you buddy, the threads have to be in good condition, not like they've been eaten by rats.
The same applies to repulsivesalvation's issue. I will ask from our resellers to double check them from now on, just in case a unit slips from our QC again.
I have the highest regards for Team GP's design, innovation, materials, production, handling, QC, transportation model and after-sales-service. Every product of theirs that I received (and I've received many / every) have come perfect out of the box. I never had any issues with any threading in anyone. They all screw in buttery smooth... ditto the locking rings.
In any case, it's always wise to give them a thorough wash, deep clean with the usual soap-n-water, a light sponge scrub over the threads, before putting them together for the first kiss(!) and they should come out working smooth in the capitals.
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*As with the Paps Lux -- I consider it a piece of Jewellery 