I'm at the point where I need to replace the master cylinder. I was able to locate a Mantelli one for about $50, now I need to establish whether this is something that can be done easily (DIY style, basically on a driveway with no specialized tools) or if it is much more complicated and demanding than that.
I'd much appreciate some input from those of you who have done this job.

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1979 240D, W123, 105K miles, stick, white w/ tan interior.