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That's my photo and mastercylinder

You might be happy to hear that the brake line in the picture was replaced..due to dodgy flare.

My newest research: I looked at a Sunny master cylinder, and it has disc/drum combination. Both lines had the same "seal/spring thing", with the same tension spring. I was expecting that the spring/seal thing would be different from the front to back. They weren't. I'm still running with no spring/seal in my rear line. The brakes are good, but not bedded in enough yet for me to give any accurate news.