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Is the top piece of the RD, the bit connected to the replaceable hanger, on those little bump stop grooves?
If you pull the RD up, does the B-screw always hit the "stop"? There's not a lot of meat to grip on there.
If there's no chain on, it moves up the whole block, right? ie. I assume you've checked the limit screws already.
Thanks for that link to the other thread, missed that. Here are few photos, don't know if it's the angles you need.