• So it looks like either I'm being stupid or the upper cup won't screw on. The lock nut will screw on just fine! Could the upper cup be faulty? I've tried numerous times and each time it starts to mesh it just locks up completely like the threading is wrong on it.

    Should I return it to wiggle and ask for another to be sent out or is it likely to be me? Or is a lot of force required? I mean the lock nut will do on with fingers and spins on and off just fine.

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