i have a few NR front derailleurs in near mint condition, the three hole version, and have thought about disassembling them to send the arms out for anodize just to make them look like they are SR. Not for resale or anything but just looks. I have not done it but may at some point. The machine shop next door to me that I do cutters for is constantly sending stuff out and has offered to throw in a few of my bike parts if I ever wanted to do so.