I converted my NR derailleur using Rally plates from Bicycle Classics. Not sure which rendition of Rally derailleur these were for. Used mine on a 13-28 Sachs freewheel with a Sachs chain, SC-40 I think. I think it shifts fine. However I only used it with a 44/48 and 48/52 half step.
Pete Geurds
Douglassville, PA