Hey, here's a side note to this whole timing chain thing: I was examining the wear on the timing chainrings (they were made for 5-6-7spd systems) and noticed that they were worn on the leading edge on the front timing chainring and on the trailing edge on the rear chainring. This clearly indicates that the pilote was doing most of the work most of the time!
This might be something fellow pilotes may want to check if you ever get any flack from your stokers! The wear on the rings will clearly show who does most of the work!
L.