Thanks Phill! That makes perfect sense now on what Sx is.
So would you agree with my assessment that the friction disc and steels for clutches A and B look fine and can be reused (assuming of course that I can get the proper Lx value using nothing larger than the 3.60mm (A) and 4.6mm (B) snap rings for clutches A and B respectively)?
Also, are the particles I see imbedded in the copper (brass?) band on disc carrier 72.190 normal/acceptable? Here's that pic again:
