Dust Extraction for small workshop
Aha, missed that. Thanks Gnube.
I'll flag that as plan B, as I am suddenly keen to try the idea
with this spring I found in my bag of bits. The only
disadvantage, if it works, is repeatability for others.
I have thought through the details of the valve design (slightly
different/better/easier to the previous ASCII art) and will try
it soon.
W.
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