Wasn't the Ofmega Mistral derailleurs made out of Delrin too.
Ofmega pretty much made the RD almost totally out of the stuff except for the pivot bushings and the cage assembly but I haven't really heard of those failing, as much as Simplex stuff did......
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72 Line Seeker
83 Davidson Signature
84 Peugeot PSV
84 Peugeot PY10FC
84 Gitane Tour de France.
85 Vitus Plus Carbone 7
86 ALAN Record Carbonio
86 Medici Aerodynamic (Project)
88 Pinarello Montello
89 Bottecchia Professional Chorus SL
95 Trek 5500 OCLV (Project)