Out of the two, and I have used the two, the Schumacher variant was FAR better as it allowed you to use shock oil and then it had a vernier adjustment to fine tune it. But basicaly they were a glorified liquid slipper clutch and most ditched the Hydradrive on the XX for the slipper which was easier to use, set and adjust.
The Viscous drive, they may still have them and adaptors on Schumachers site.
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