I don't know how the helical on the Wanderlust is designed, but the other day I was playing with a helical and it is pretty complex. It had 3 sets of concentric threads unlike a normal screw which is one set.
I had not noticed the complexity before.
Then there is the inside and outside parts that must mesh at very close tolerance. This thing was brass and very carefully machined, bet it was not cheap new.
Not so simple.
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