If they are being made by hand, it looks like a painstaking timeconsuming job. No wonder they are only a special order item now.
Oz,
I've been thinking about these VSF's and by the look of Steve's 'dissection' photos, it appears they wind these on
a largish cylindrical mandrel and then squash them flat. If this is the case I think the squashing process would result
in considerable stress at the corners with the resulting differential movement between layers.
Maybe a good reason why a/ there have been quite a few failures b/ they aren't so keen to continue production
and c/ they sound different than the others.
Just a thought.
Z