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The one in the link looks like it's missing the "clamp". Mine has a bakelite disk about 5" in diameter that holds down the paper/magnetic-coated disk flat to the turntable. The disk has a spiral groove in it, and the tonearm has an outrigger pin that engages the groove. The pin guides the head in a repeatable fashion over the flat magnetic disk. There's a tracking control to vary the pin position so that the record/playback head on the end of the tonearm tracks appropriately.
Your referenced dual-use version sounds like the "ultimate expression of the art" for this media, to be sure! It would seem they would pick 33 1/3 as the table rpm -- I don't know the speed of mine, but it would stand to reason they wouldn't re-invent the idler wheel...
Thread now devoid of S-VHS content. Oops.
Chip
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