Good find dunf, you can always grow new skin and eyeballs.
Teensy bit of progress this evening. I tried some stainless wire wool. left over from exhaust packing, on the fuel cap ribbed ring. It's brightened it up a lot more and evened the colour up, so this could be the way forward. I like stainless for this better than steel wool as it doesn't leave lots of little bits everywhere that go brown!
Also tried an idea on the broken zip pull tag on my Mandarina Ducks. This definitely has legs and I'll try and do this on my jacket too. I know it does let a cat out of the bag, but there will soon be some news.
