Thanks John and David for further advice.
Chris
http://www.wildechoes.org
--- In "Avocet" <> wrote:
>
> I've used a metal plate with a tapped 1/4" thread in it. The European
> spec for the tap is 1/4 inch Whitworth thread (BSW). The pilot hole is
> 5.1mm but 5mm works as well. If you are using aluminium. a drop of oil
> will prevent the tap binding.
>
> David
>
> David Brinicombe
> North Devon, UK
> Cogito cogito ergo cogito sum - Ambrose Bierce
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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