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J-W-P, I also saw that video recently, it was posted on another site, and it was what got me to revisit the dust collection issues with my SCMS again. Unfortunately, that video is actually several years old and it appears that particular product never did make it to the marketplace. Too bad as it did appear to work well in the video.
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I would suggest that the improved dust collection had more to do with the vacuum/Dust Deputy combo than the shroud. For the two tests, he was kind of comparing apples and oranges. To get a meaningful comparison, he needed to compare the amount of stray dust using the vacuum/DD combo first without the shroud, and then with it. The test just using the bag is meaningless.
A retirement dedicated to fine woodworking and bad golf.