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Wheels,
just had a quick look at your link and after having looked at the pi-in-the-poke stuff, after falling down laughing at a couple of the "designs", the picture of the "concrete worms" caught my eye.
This blamed the problems on salt in the sand. I immediedlty thought that this might be the fundamental point.
In UK most of the sand (especially close to the coast) is recovered from the sea, and even after washing is normally still saturated in salt. I have only been to NZ once but should think that from what I saw then, most of your sand is recovered from land sites.
Where does the sand come from in USA?
Perhaps this is why NZ ferros have a much better reputation?
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"Be wary of strong drink. It can make you shoot at tax collectors - and miss."
Robert A Heinlein
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