Found the eccentric, definitely not easy to get to. It's where the pedal attaches to the pushrod for the master. My dad (bigt M/T guy, used to race) looked at it and tried it out, he said it was actually preferable. There looks to be about an inch of play. I think I'll drive it like this for now. Maybe if I'm bored, I can mess around with the eccentric.

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1983 240D 3.0T 4-speed manual, now sold

1989 Subaru GL Wagon 5-speed Touring Edition

Well, not that it matters here, but while those are shown together, the release bearing really is a separate part. It is slipped on the end of the piston in that picture.

SAAB started using such a setup in about '76. Prior to that there was an external slave cylinder with a fork. The beauty of the annular ring slave cylinder is that it is completely self-adjusting. Sort of like a disk brake. The piston moves further into the cylinder as the clutch disk wears, pushing a bit of fluid back through the master cylinder.

Well, aren't the external slaves self adjusting too? The hydraulic cylinder and throw out bearing are just connected through a linkage rather than directly.

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1983 240D 3.0T 4-speed manual, now sold

1989 Subaru GL Wagon 5-speed Touring Edition

I have never seen one in my life that worked that way. The slave cylinder rests at the end of its stroke when you remove your foot from the pedal. This is not the case with the annular cylinder.