The Simplex front derailleur body on my PX 10, which is made from the space age 1960's plastic known as Delrin has broken where the seat tube clamping band(metal)pivots. I have tried to repair this with JB Weld but the JB does not bond to the Delrin. Any sugeestions for a repair or better yet does anyone have a replacement derailleur body or complete (parallelogram type) Simplex front derailleur for sale? thanks and Merry Christmas to the CR list, Rod Handsfield, Wichita - where I did 20 miles on my Falcon San Remo fixie today, Kansas.