I've produced many spiders and spider combos over the years, easily 100+ and I've never seen one corkscrew nor have I had to cull one. Some seem to have no wobble at all even though they all eventually have the head tilt which I consider a mild wobble. I've only had one customer complain about the wobble but he owed me some money so we called it even. I think the wobble concern is overblown but if you don't want to own or breed them that's fine.
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