I just ordered a CD-ROM which goes through a step-by-step rebuild of a 717.430 transmission (1986 300E), which likely is nearly the same beast as what you have. I'll take a look for you when it arrives. You're right....for a synchro spring to be distorted from a half-round shape to what you have in nearly perfect fashion seems impossible.
Brian

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Brian
1995 E320 wagon