I've been there. Trying to get a tight bend at the end of a piece of line is
Ya know what works good to get rid of some of that corrosion on your carb? A nylon bristle brush. Either hand held or better yet a small one for a drill. (even dremel size to get into the nooks and crannies.
It will brush most of that off without scratching or sanding the metal at all. Good for corroded aluminum intakes and alternators too.