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That is the style fitting I would use as well. We use them to run the pneumatic systems on the machines we build. They hold and seal very well and allow for quick change capability.

I have seen those pumps also at HF and do feel they would work. I have a few vacuum generators that also use air to produce the vacuum. It have been a plan of mine for a time now to make up a vacuum...

I like that idea. The insert would be awesome. Carve it up, toss in a new one.

I have thought about it as well, but never gave it a try. Thought it may work as they use vacuum on the larger table routers.