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I think I remember that video now. The jig was essentially a piece of plywood with some holes in it that you stuck your board through so you could work on one end. Is that what you were thinking of?
We do segmented turning, not because it is easy, but because it is hard.
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Sounds like we might be talking about the same video but don't recollect plywood in the jig specifically.
The arrangement I remember held the stock by one end, about waist high. It seems like 6 or 8 feet was sticking out. A man could walk alongside the board pushing a circular saw, making a long rip cut. The board was not held level. It sloped downward toward the fixture. The direction of cut was downward toward the fixture.
This arrangement would naturally want to tip the fixture over. I don't remember if the tipping was resisted by the weight of the fixture or some sort of anchorage to ground.
The Lumberloc is interesting and could conceivably be used to construct a fixture along the lines of what I've described but I don't think it was used in the video, unless in the form of a homemade version.
I don't want to brag, but some of my wood is on its 2nd or 3rd project!