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Thanks for that Merlin.
Not sure how smooth & regular mine is. It's actually made out of an old kithchen sink tap filter comprising of a 20mm round piece of fine brass mesh, as mentioned, about 85 LPI.
The other one I want to make comprises of extremely thin sewing monofiliment.
Tube currents in an SCT would no doubt give you a false test conclusion here do you think?
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