The pineapple juice will take quite a time but be patient. It will be worth it in the end. Process is to let it soak for a few days and use (maybe household Scotchbrite--that green abrasive cloth) to remove loosened rust. Keep repeating the process until most of the surface rust is gone, and then use fine Steelo once the metal surface is revealed. You will also need to refresh the pineapple juice frequently. You will end up with a greyish surface on the metal but this is easily removed with a light rubbing with Steelo. The process will not damage the surface.
As far as part replacement is concerned, my policy has always been to use what you have, but obviously if parts are broken or missing then they will have to be mended/replaced. If you have a local friendly gunsmith, he may have boxes of old gunscrews which could just suit your needs.
In my opinion the missing barrel band would be brass, but get the colour right when you chose the piece. Brass DOES vary in colour. Check out books to get an idea of what it should look like. As far as the finial goes, I would glue it in place and put a suitable brass plug in the hole. PM or email me if you like with any other questions.
Regards Stu
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